If you want to be stocked for soap for some time, Amazon has a great deal on Lever 2000 soap.
Lever 2000 Moisturizing Bar, Original, 4.5-Ounce Bars in 16-Count Packages (Pack of 2) (which makes it really 32 bars) for just 18.28
BUT if you use the subscribe and save option located on the right hand of the screen you will save an additional 15% off. After you receive your first shipment you can cancel your subscribe and save plan with no penalty. I usually set my subscribe and save to 6 months that way I have plenty of time to cancel it.
You won't need soap for a LONG time after this purchase!