Hi Stush, welcome!
You'll find quite a few places that carry the historic irises. Our other forum moderator, Irisloverdee will be carrying some this year. Her business is Snowpeak. Also Superstition iris has a lot of historics.
Here's Superstition. You really need to order a catalogue from them , as they only have some pictures online
http://community.webshots.com/...
Here's where you get the catalogue from
Here's Snowpeak
http://www.snowpeakiris.com/
I'm sure others will have other sources, but those are two I find very reliable.