The GVP A530 is a very popular addition for any A500 and they usually sell for a very decent price. If you are going to offer it on eBay, take the time to add good pics, and write a long description telling everyone how clean, tested and guarantee it against being DOA (dead on arrival). If you have a manual and the install disks, that will help the price go up too. I have one that I plan on keeping for the one A500 I plan on keeping in my collection, the other has a SupraDrive and it will either be sold/auctioned or given away to a friend.
If you are afraid of it going too low on eBay, use the "Reserve Price" option to get at least the minimum you want (but then it may not sell at all).
Good Luck :-)
