The following link shows the process for sharpening a scraper. This is pretty easy stuff. In the tutorial, they say that you can't get a good hook with a screwdriver. I disagree in that while I don't have a burnisher, a screwdriver with a chrome shank works well for me. You only need a metal file to square & flatten the edge. Nothing exotic. Available at Lowes.
Using and burnishing a cabinet scraper
Scraper stock can be purchased almost anywhere from Lowes (pretty sure) to the online stores like Rockler and Woodcraft. Sandvik is a good brand.