There would be no need to overnight frozen anything unless you needed it the next day. Standard UPS shipping with perishable items is not that expensive, like I said, I work with shipping of frozen foods every day. And dry ice isn't very expensive, you can get 10 lbs for 5$ and for a company that uses a lot of it I can only assume they would get a discount on something like that. Lets just put this into perspective. I can order an 7lb ham for $7o.95 and that includes standard deliver. That ham will feed 14-18 adults and comes in a not only a cooler but is packed with dry ice and re-useable ice packs. You really think 66 buck for 2 lbs of rats is worth almost the same price? Come on....