Blue J iris in Nebraska grow wonderfully for me here in Kansas.
Snowpeak is always true to name and good prices. I order from her and BlueJ every year.
Aitkens Salmon Creek has more than TB iris--I have ordered spuria, japanese iris, siberians and others from them and have been very pleased. They've been very helpful when I had questions.
Sutton iris has a great selection of rebloomers and space age.
Keith Keppel, Superstition, MidAmerica, all send huge huge iris.
Stout's Dancing Tree in OKC has a great selection.
Many others that I loved shopping are no longer selling.
My favorite sources are iris club sales! If you live within a few hours of a city that has an iris club, you might look into joining, or at least find out the dates for club sales. I learn so much at the meetings, and meet other iris enthusiasts. The springtime regional meetings are terrific because they usually have garden tours. I come home with an aching hand from holding the camera still for thousands of photos! Our club invites hybridizers to speak and you just can't beat first hand knowledge. The club sales feature hundreds of iris at very reasonable prices.