I just bought a ton of stuff (269 lbs) from SC and the shipping on it was $307.00. So it's a little over $1/1 lb....
I'm gonna guess your order shipped via UPS or FedEx ground? If so, you might want to look into having Soaper's Choice ship your orders by truck. The shipping cost might well be about half of what you paid -- my rough rule of thumb is to look into the availability of truck shipment (what's sometimes called LTL, less than truck load) for any shipment over about 100 pounds.
Being that you live in rural Wisconsin, you might want to talk to your local farmer's co-op or sweet talk someone else who has a loading dock. See if you could have the shipment delivered there for you to pick up later. That's what we did before we got a skid steer with a pallet fork. You should be able to remove the stretch wrap or banding and offload the individual boxes by hand into your car or pickup. It's awkward, but works.