Say about £35-40. It's what I would get on eBay anyway, judging by similar auctions. Eveything works fine, it's just this little problem. So, you can either use it for spares or repair it etc... I'll give you the leads, and I still have it's box. I think i'll miss it, I live the V4 'quirks', LOL!
I am getting a mates PS2 for the weekend, gonna check it out. He's only had it 6 months and it's chipped, so i'll take a look, and maybe i'll buy it. He says I can make him an offer, as he doesn't even like the PS2 - only used it twice, but prefers his XBoX. Depends on the version and chip - he doesn't seem to know what chip it is.