Transporting freezer stash for a move 8-10 hours away

JuliaKL

Hoping someone can help!  We are moving on Thursday, about an 8 hour drive (probably closer to 10 with two boys!), and I have probably 500 oz of frozen breast milk that I WILL take with me )  I had always heard of packing it on dry ice and overnight-ing it, but cannot find anywhere that still sells dry ice!  I've spoken with grocery stores, fish stores, dairies, and had no luck.  So I'm thinking of packing it with a ton of regular ice in coolers and replenishing halfway there.

Anyone with any experience or recommendations?  Much appreciated!!!