If you want specific varieties just post the list, but of course leave out the newer ones that cost $$$ each! They have not had time to increase anyway. Also be alert to posts that have offers of spreading the excess around to others. The garden lists can help as many people list what they grow. You will have a fairly low cost iris garden in no time. Details are usually taken care of using the mail option on top left of the pages.
Various groups offer sales during the year, some local and some by mail. The Historic Iris Preservation Society has one each summer [historiciris.org] with the list posted already. Members get a 2 week head start in ordering. Just don't buy from a sale that delivers after your cutoff planting date so as to minimize losses over the winter.