I think it really depends on just how much a LOT is. With fiberglass, I feel like under 200lbs (maybe the threshold is higher) and you're best off trying to find a supplier within and hour or so driving distance and picking it up yourself (provided your time isn't worth $100/hr). That's what I generally do. I pay more per yard or pound, but the savings on shipping are worth it. I've used Merton's and LBI in Connecticut, but I'm located in CT. If your order would more than say 1 roll, you could always call and see what kind of price break they could give you.
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