One of the members on here recently put a leather bound 1st edition on eBay, it only went for $511 if I remember correctly. IMHO that's a travisty that it went that low.
I'm assuming the book was not advertised well and it didn't have a high enough starting price. I discussed this earlier..
. I've sold and seen unsigned first and second editions sell for upwards of $450.00. These were unsigned editions. If the OP does it right, he should get about $350.00-$400.00 (each) out of the books according to current market value..