Joe -- I would like to inject a word of caution. If you're seeing these *ads* on Ebay -- beware. The is one scammer on there, in particular, who lists almost everything she has as a rebloomer. The truth of the matter is that she has no named Irises at all -- she takes your money and sends you rhizomes of ditch Irises -- and it takes two or three years for you to find out that she lied.
So do your homework. Best thing is to only buy from known Iris growers/breeders/vendors.