Hi,
Welcome back to cel collecting, but are you sure 
you want to start again? I hear that it's more 
addicting and harder to give up the second time 
around. ;p I have some cels for sale on Ebay 
right now, one of which is from the yaoi OVA Ai 
no Kusabi. 
http://search.ebay.com/_W0QQfrppZ50QQfsooZ1QQfsop
Z1QQrdZ0QQsassZhannahchic

There have been a bunch of for sale posts lately 
on Anime Beta (www.anime-beta.com). That's where 
all the cool kids are hanging out lately. :p 

Happy hunting!