I've been wanting to get an extended battery for my PSP for a while but I've only seen the Official Sony one for $40, surely you cheap asses know of a better deal!
this probably doesn't help at all, but I've been told this site is reputable in the sense that it's not a scam site or anything. Whether or not they're any good or otherwise, I have no idea:
The site is not a scam but the batteries ought to be fake/bootleg for those prices. A customers comment says the 1800mAh one is not compatible with pandora.