The problem is they don't have a lot of value if they're in good shape. I had the same problem with an old Dodge minivan I used for work. Bad engine... no value. I got around $250 for it at a garage sale.
Here's a B2000 that sold on eBay for $400 needing an engine.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6317&item=2446575614
You might call around to the junkyards to see what a used engine would cost.