I went about getting my PIV the same way Tahoe is doing, because they seem to be cards that people don't want to get rid of. It is a very nice classic Amiga card after all. Well Tahoe can ask, and people can respond with prices. It depends how badly he wants it, whether he'll pay a high price.
Of course the advantage of doing it like this is that he gets to deal with an AO user instead of a stranger on ebay, which means he is less likely to be ripped off in terms of getting the card and having it work properly.