Yes, 1 S&H charge for 1 shipment. I just got a shipment from them, in fact. They accept payments via PayPal, so you need either a CC that works with PayPal (mine doesn't, for example) or a PayPal account. If you're in the U.S., probably choose HongKong Post as your shipping method -- that will go through U.S. mail. My total order was ~$50, and I didn't have to pay any customs.
Oh, and it doesn't surprise me at all to get a small resistance on the leads from a DMM. Mine are 3 ohms. So, you just keep that in mind.