I've never been able to find the CB70 tubs in any store. You can order them online from office depot,
http://www.officedepot.com/a/product...-Gallon-Clear/
But I've found that specialty made tubs that are made by reptile caging companies using the same dimensions as the CB70s are far superior to the iris tubs.
I'm currently using the Vision tubs.
http://www.visionproducts.us/htm7/tubs.html
Which I LOVE... but I've heard that the ARS tubs are very good too.
http://www.arscaging.com/arstubs.html
Believe me, I've looked EVERYWHERE trying to find CB70 tubs locally but they're just not out there, at least not around here.