Shipping and hazmat is added after the sale. I assume they don't have a sophisticated enough software/website to calculate shipping and obviously don't do a flat rate shipping. On my order from last Friday, shipping and hazmat was $43.35. That was for 17lbs of assorted powders shipped from their location to Boise, ID (works out to $2.25 per LB). I compared the actual charge on my credit card vs. the total powder costs. *No sales tax was collected.
Powder Valley pricing is great. On my last powder order from them it was $35.90 for shipping/hazmat. That was for 10lbs (that worked out to $3.59/lb). I always spread my shipping & hazmat cost over each pound of powder. I usually hold off ordering powder online unless I can get enough volume to spread that fee out over many pounds.