iHerb is offering $5 off your first purchase with coupon code EXPIRED. If your item is $5 or less, the entire purchase price is taken off. Shipping charges still apply, but that seems to be between $2-4 for smaller items.

This coupon CAN also be combined with all eligible volume ($60+ for 5%-14% discount) and shipping discounts ($40+ for free shipping).
This is the only code you need: EXPIRED.