I've got some juveniles in a 55-gallon tank. A member at AC was nice enough to visit TX Aquaculture and have the owner bag about 50 to send off my way. She sent them USPS Express and they arrived safe. Not sure if I would be comfortable sending them out to Iowa. Wish you lived closer.
There is a member on aquabid selling them too. I believe they go by the moniker "mean ass blue prawn". lol You should see if he will send you some. I believe he is out of NJ.
HTH