If you currently have tools like a band saw/scroll saw, drill and a sander the cost will be limited. If you already have tools then all you'll need is the kydex, rivets, tek-loks, rivet setter, a press of some kind and a method of heating the kydex. To heat the kydex I picked up an electric frying pan for 6 bucks at a thrift store. When I started all I had was a Dremel tool, two pieces of foam/wood and a hand setter for the rivets. I have not been doing this anywhere near as long as some people but I would say to start you can make do with just a Dremel ,press, toaster oven/heat gun/electric frying pan, raw materials. I would estimate the cost of around 100-150 to get started. When I look back that's about my initial investment starting from nothing. I do strongly recommend getting a band or scroll saw because it was a serious pain cutting a decent shape with the Dremel tool. Check out knifekits.com they carry a bunch of stuff to get you started.