Todos los recambios de portatil suelen ser astronomicos xD Precisamente, el precio de ese cargador que has puesto es bastante barato para ser un cargador original.
Si quieres uno compatible puedes preguntar en cualquier tienda de informatica, te lo pueden vender sin problemas, pero dudo que lo encuentres más barato que el que acabas de poner.
Ten cuidado, porque en la descripción del link no pone tu modelo de portatil:
Sony Vaio VGN-B Series VGN-B1XP, VGN-B100B, VGN-B90PSY4, VGN-B3VP, VGN-B100B05, VGN-B90PSY5, VGN-B3XP, VGN-B100B07, VGN-B90PSY6, VGN-B90PS, VGN-B100B11C, VGN-B90PSYA, VGN-B90PSY1, VGN-B100B23, VGN-B90PSYB, VGN-B, VGN-B90PSY2, VGN-B1VP, VGN-B100, VGN-B90PSY3
Sony Vaio VGN-X Series VGN-X505, VGN-X505/ZP, VGN-X505VP, VGN-X505ZP
Sony Vaio VGN-TZ Series VGN-TZ31WN/B, VGN-TZ22VN/X, VGN-TZ21VN/R, VGN-TZ1RMN/N, VGN-TZ31XN/B, VGN-TZ31VN/X, VGN-TZ2AWN/B, VGN-TZ21VN/X, VGN-TZ1RXN/B, VGN-TZ32VN/X, VGN-TZ31MN/N, VGN-TZ2RMN/N, VGN-TZ21WN/B, VGN-TZ20MN/N, VGN-TZ11MN/N, VGN-TZ3AWN/B, VGN-TZ2RXN/B, VGN-TZ20WN/B, VGN-TZ11VN/X, VGN-TZ3RMN/N, VGN-TZ31MN/P, VGN-TZ21XN/B, VGN-TZ11XN/B, VGN-TZ3RXN/B,
Sony Vaio VGN-T Series VGN-T170, VGN-T350P/S, VGN-T260, VGN-T90PSY1, VGN-T150P/LKIT2, VGN-T340P, VGN-T240P, VGN-T370P, VGN-T140P/LKIT2, VGN-T2P/L, VGN-T170P/L, VGN-T350P/T, VGN-T260P, VGN-T90PSY2, VGN-T150P/T, VGN-T340P/L, VGN-T240P/L, VGN-T370P/L, VGN-T140PL, VGN-T2XP, VGN-T170PL, VGN-T360, VGN-T, VGN-T260P/L, VGN-T90PSY3, VGN-T155, VGN-T350, VGN-T250, VGN-T50B
Sony Vaio PCG-VX Series PCG-VX89K1, PCG-VX89P, PCG-VX71P, PCG-VX88, PCG-VX88P, PCG-VX89, PCG-VX89K
Sony Vaio PCG-TR Series PCG-TR1/A, PCG-TR2MP, PCG-TR2, PCG-TR3AP3, PCG-TR1/AP, PCG-TR3, PCG-TR2/A, PCG-TR3E/B, PCG-TR1/B, PCG-TR3/B, PCG-TR2/AP1, PCG-TR5AP, PCG-TR1/P, PCG-TR3/SP, PCG-TR2/B, PCG-TR5B, PCG-TR1A, PCG-TR3A, PCG-TR, PCG-TR2/P, PCG-TR5MP, PCG-TR1AP, PCG-TR3AP1, PCG-TR1, PCG-TR2E, PCG-TR1MP, PCG-TR3AP2
Sony Vaio PCG-GR Series PCG-GR390, PCG-GR215SK, PCG-GR300K, PCG-GR114SK, PCG-GR270K, PCG-GR390K, PCG-GR215SP, PCG-GR314MP, PCG-GR150K, PCG-GR270P, PCG-GR390P, PCG-GR230, PCG-GR315MP, PCG-GR170K, PCG-GR290, PCG-GR4141SK, PCG-GR250, PCG-GR370, PCG-GR214EP, PCG-GR290K, PCG-GR, PCG-GR414SK, PCG-GR250K, PCG-GR370K, PCG-GR214MP, PCG-GR290P, PCG-GR114EK, PCG-GR414SP,
Sony Vaio PCG-7... Series PCG-705E, PCG-711, PCG-705, PCG-705C
Sony Vaio PCG-4... Series PCG-431L, PCG-481M, PCG-432L, PCG-491L, PCG-441L, PCG-492L, PCG-461L, PCG-4A1L, PCG-462L, PCG-4F1M, PCG-4B1L, PCG-462M, PCG-481L
Sony Vaio VGN-UX Series VGN-UX50, VGN-UX1XRN, VGN-UX1XN
Sony Vaio VGN-TX Series VGN-TX790PK1, VGN-TX3HP/B, VGN-TX630P/B, VGN-TX1XRP/B, VGN-TX750P/B, VGN-TX1XP/B, VGN-TXN27N, VGN-TX5MN/W, VGN-TX670P/BKIT1, VGN-TX4XTP/B, VGN-TX, VGN-TX90PS, VGN-TX3HP/L, VGN-TX650, VGN-TX2XP/B, VGN-TX770, VGN-TX1XP/L, VGN-TXN29N/L, VGN-TX5VN/L, VGN-TX670P/W, VGN-TX5MRN/W, VGN-TX15C/W, VGN-TX90S, VGN-TX3HP/W, VGN-TX650P/B, VGN-TX2XP/L,
Sony Vaio VGN-S Series VGN-S9, VGN-S250F, VGN-S91PSY6, VGN-S2XP, VGN-S6, VGN-S170PVNC, VGN-S90PSY6, VGN-S270B, VGN-S155, VGN-S36TP/S, VGN-S90PS, VGN-S250FP, VGN-S92S/S, VGN-S1, VGN-S3, VGN-S62S/S, VGN-S175, VGN-S91PSY1, VGN-S1VP, VGN-S270F, VGN-S16GP, VGN-S370F, VGN-S90PSY1, VGN-S260, VGN-S150, VGN-S350F, VGN-S7, VGN-S18GP, VGN-S91PSY2, VGN-S1XP, VGN-S270P
Sony Vaio PCG-Z Series PCG-Z1, PCG-Z1RMP, PCG-Z1M, PCG-Z1VFP, PCG-Z1A, PCG-Z1RSP, PCG-Z1RA, PCG-Z1WA, PCG-Z1A1, PCG-Z1VA, PCG-Z1RAP1, PCG-Z1XMP, PCG-Z1AP1, PCG-Z1VAP, PCG-Z1RAP1KITB, PCG-Z1XSP, PCG-Z1AP2, PCG-Z1VAP1, PCG-Z1RAP2, PCG-Z1AP3, PCG-Z1VAP1KITB, PCG-Z1RAP3, PCG-Z1DMH, PCG-Z1VAP2
Sony Vaio PCG-V Series PCG-V505AK, PCG-V505DX, PCG-V505BXP, PCG-V505R, PCG-V505AP, PCG-V505DXP, PCG-V505CP, PCG-V505AX, PCG-V505ECP, PCG-V505, PCG-V505D, PCG-V505AXP, PCG-V505EX, PCG-V505 CTO, PCG-V505DC1, PCG-V505B, PCG-V505MP, PCG-V505A, PCG-V505DMH, PCG-V505BP, PCG-V505P, PCG-V505AC, PCG-V505DP, PCG-V505BX, PCG-V505PB
Sony Vaio PCG-SRX Series PCG-SRX87P, PCG-SRX51P, PCG-SRX99, PCG-SRX51PA, PCG-SRX99K, PCG-SRX51PB, PCG-SRX99P, PCG-SRX77, PCG-SRX77P, PCG-SRX, PCG-SRX87, PCG-SRX41P
Sony Vaio PCG-C Series PCG-C1MHP, PCG-C1VG, PCG-C1VXS, PCG-C1X, PCG-C1F, PCG-C1MGP
Sony Vaio PCG-6... Series PCG-682L, PCG-661L, PCG-691L, PCG-661M, PCG-6B1L, PCG-661R, PCG-6D1M, PCG-6B2L, PCG-671L, PCG-6R1M, PCG-6N2M, PCG-672R, PCG-681L
Sony Vaio PCG-3... Series PCG-3122, PCG-3192, PCG-3212, PCG-321A, PCG-322B, PCG-3102, PCG-325A, PCG-3112
Sony Vaio VGN-U Series VGN-U750, VGN-U750P, VGN-U8, VGN-U, VGN-U8C, VGN-U50, VGN-U8G, VGN-U70P, VGN-U71P
Sony Vaio VGN-TT Series VGN-TT11WN/B, VGN-TT21JN/B, VGN-TT11VN/X, VGN-TT11M/N, VGN-TT11LN/B, VGN-TT21WN/B, VGN-TT21VN/X, VGN-TT21M/N
Sony Vaio VGN-G Series VGN-G11XN/B, VGN-G21XP/B, VGN-G11XRN, VGN-G11VN/T, VGN-G21VN/B
Sony Vaio PCG-X Series PCG-X505, PCG-X505/CP, PCG-X505/P, PCG-X505/SP
Sony Vaio PCG-U Series PCG-U3, PCG-U3/P, PCG-U1 Sony Vaio PCG-SR Series PCG-SR31K, PCG-SR11K, PCG-SR33, PCG-SR17, PCG-SR5K, PCG-SR17K, PCG-SR7K, PCG-SR1K, PCG-SR9, PCG-SR21K, PCG-SR27K Sony Vaio PCG-1... Series PCG-181L
Sony Vaio PCG-5... Series PCG-571A, PCG-505, PCG-505X, PCG-505LS, PCG-571N, PCG-505E, PCG-51AL, PCG-505SN, PCG-581L, PCG-505EX, PCG-531A, PCG-505TR, PCG-581M, PCG-505F, PCG-532A, PCG-505TS, PCG-582M, PCG-505FX, PCG-551L, PCG-505TX, PCG-591L, PCG-505G, PCG-561L, PCG-500, PCG-505V, PCG-5A1M, PCG-505GX
Sony Vaio PCG-8... Series PCG-882L, PCG-883L, PCG-884L, PCG-833L, PCG-885L, PCG-873M, PCG-881L, PCG-881R
Sharp Actius A series A250, A280, A290, A110, A150
HP por ejemplo, el conector de los cargadores de segun que modelo de portatil son distintos, incluso el de las propias impresoras que, a primera vista suelen ser iguales, en realidad no lo son. No estoy seguro si con Sony ocurre lo mismo, pero yo no me la jugaría e iría a una tienda física
Saludos!