Hmmmm....Yes. You really do have to deal with reputable Commercial Iris growers for all of your rhizomes. I have never been scammed on Ebay with Iris rhizomes though. I have gotten a lot of Iris rhizomes just this year off of Ebay in March/April and was pleased with all of the rhizomes I received.
I just finished planting and completing one of my Iris beds. I planted 15 new iris rhizomes in the bed. One bed is now done. I have another yet to clean up and prepare for more rhizomes. I had a very successful day!