I have ordered quite a bit from them, with no real issues. My larger orders (300-400$) have cost me as much to ship as a single plastic pulley, though (20$). It was a bit difficult for me to spend 25.00$ for a 5.00 pulley......but I realize places have minimum orders. I would bet your shipping costs would not change much if your order was substantially bigger.
It looks like you're not exactly around the corner from them, though......lol.
I have similar experiences with Moore Gear, and Roton with single piece orders. I bought a 4' section of rack from Moore, and the cost was 28.00. After shipping, it was about 65.00.......lol.
It's just the way it is, I believe. It more of a pain in the ass per dollar made to service small orders, and most companies are doing everything they can right now to see that they still generate income.