Where can I buy the dense blue styrofoam by Dow in the Phoenix area??

Answer 1

I tried Yahoo yellow pages and got a lot of hits under "refrigeration." There's a school at http://www.dexknows.com/detailssearch.ds?detailsListingId=10000000002964999-60587-3295-1-1&incr=1&from=yahooYP
and a contractor at http://www.polarisrefrigeration.com/

Good luck with your search!