Don't quote me, but I believe the warm pack from My Pet Chicken is about $25 by itself. And you can probably blame the Post Office for that one, not the hatchery.
I do want to amend my statement, though. Yes, four days delivery time is on the P.O.'s head, not the hatchery's, however, you need to take into consideration the weather where the hatchery is located, where you are located and all points in between when ordering chicks. It may just be too cold, period, to get chicks delivered by mail.