The Shea Butter People is a company in which manufactures and sells all sorts of shea butter products. Shea butter is said to be beneficial to one's skin and hair.
Handmade soap, especially ones with high amounts of Shea Butter like this one: https://sealsoapworks.com/collections/family-favorites-handmade-soap/products/goatmeal-honey-handmade-soap
Shea butter is a great after sun care moisturizer, but the butter alone does not contain enough SPF agents to effectively protect the skin if worn alone. However the butter is potent enough to help ease sunburns by regenerating cells that are cooked during sun bathing. Use unrefined shea butter not the refined one.
You'd also need to know the butter's density and the volume taken by one gallon to calculate that.
The best kind of soap to use is one that is gentle on your skin, free of harsh chemicals, and matches your skin type (e.g. sensitive, oily, dry). Look for soaps with natural ingredients like olive oil, coconut oil, or shea butter to help maintain your skin's natural moisture balance.
Bath and Body Works sells various soaps and lotions. One can purchase soap from the store itself or from their website. It is not possible to purchase used soap, as that would be unsanitary.
One can purchase Mistral soap, which is a wonderfully scented French soap, from many different online sites. Some of these online sites are Amazon, Smallflower, and Nextag.
There are many places where one can purchase green soap. One can purchase green soap at popular retail stores such as Lush, Bath and Body Works, and Walmart.
One can purchase cheap laundry soap from places that have it on sale, wholesalers or dollar stores. However, it is usually cheaper for one to just make their own laundry soap at home.
It is recommended to purchase Roger & Gallet soap from their online store. Although Roger & Gallet soap is available from other sources such as Amazon.
Amazon.com offers 4 oz. tins of fair trade shea butter (unscented) for $14.95. Other places charge less, such as "blujay marketplace" in bulk (1 pound) for $4.99. Nordstrom lists a 4.9 oz container for $40. The price on fair trade shea butter varies widely depending on the company. Google Shopping is a good tool to compare prices. Find the best one for you, but be careful of scams!
Sandalwood Soap comes in a 5.3 ounce bar. This soap is primarily used for one's hands and body for cleaning purposes. One can purchase this soap at almost any retail store.