Amazon offers Stansport Bucket-Style Portable Toilet for free shipping.

Product Description:
Who says backcountry adventures have to be dirty and uncomfortable? With our portable, bucket-style toilet, you'll be able to take care of business in the backcountry, in a clean, comfortable way. The lightweight bucket base holds up to 4.5 gallons, and supports up to 300 lbs. For easy clean-up, this system is compatible with Stansport #272 and 273-3 toilet bags, as well as most 8, 10, and 13 gallon trash bags.