I've ordered other hazmat stuff (bottom paint, gelcoat, MEKP, etc) from several other companies and the main issue is using ground, cost increase is small. When looking at US Com shipping charges they appeared a bit high but figuring they would keep it in minimal boxes. Talking to them they said they had to put each hazmat item in a separate box.
Get me once shame on you, get me twice shame on me, don't plan on doing it again. Will do a lot more checking before I buy something else. Still need bottom paint