Hi, M94. The bases listed under "Bramble Berry Bases" are SLS-free. The "Bulk Melt & Pour Soap Base" does contain SLS, though. If you click on one of the bases, it will list all of the ingredients.
As far as loaf molds go, I like BB's 9-in. loaf mold:
http://www.brambleberry.com/9-Inch-Loaf-Mold-P5050.aspx. If I remember correctly, this loaf usually gets me 8 bars @ about 4-5 oz. each. They have a 12-inch loaf mold, too. The dimensions and capacities are listed on the product description.
BB also has several different kinds of rectangular individual molds. Just type "rectangle" into the search box on BB's website and you'll get many results. The cavity size and weight/capacity for each soap are also given.
Have fun soaping!