You might want to check your local thrift store for leather as well. At our Good Will you can occasionally find leather coats and skirts for well under ten dollars. If necessary, you can laminate the leather with rubber cement for more thickness. I have made a sporran with leather from a black skirt and laminated leather from a suede coat for the inside. Leather belts for straps and other parts can be had for around a buck. Here's a picture of my sporran strap made from an old belt, braided leather and some inexpensive hardware from Tractor Supply (Chicago Screws, D rings and guick release fastners).



As you can see by my gear, I'm not one of the landed gentry, so "making do" is pretty much a way of life. BTW, the sporran shown is not the laminated one.