I love their soap, but I only buy it when there's a promotion going. This one is pretty sweet:
Going on now you can get 4 for $15 of 6 for $20.
Put 12 in your cart and your total should come to $40
Use code "MAY40" to take $10 off your $30+ order
Shipping should be $1 with that code also
Comes out to $2.50/bottle, regularly $5/bottle