So I signed up for an eBay account a couple of months ago. and have made the following purchases (all including p+p):
Bearsuit - Oh:io for £4.50
Elliott Smith - s/t for £3.20
Elliott Smith - Either/Or for £4.45
Elliott Smith - From a Basement on the Hill for £4.20
Q and Not U - Power for £3.40
Sonic Youth - Sister for £5
iLiKETRAiNS - Progress, Reform for £2.20
My Bloody Valentine - Loveless for £4.40
DJ Shadow - Endtroducing for £2.20
The Smiths - Meat is Muder for £3.70

All of them in good condition as well. I'm a little poorer and it can be a little stressful occasionally, but how much richer my CD collection is. :)