re: A530
$299.95 won't happen, you are likely scaring buyers off with this BIN. Pure auction you may get ~$150, if you get a few serious buyers/collectors in a bidding war. BIN ~$79-$99 may get snapped up if you want a fast sale.
eBay is a strange beast, you could gt much more or almost nothing. Don't believe some of the bizzare ultra high winning bids for C=/amiga stuff you see, IMO most of those are fakes.