Not sure what you mean by "cheap" but look up plastic distributors in your city and shop around... There is a pretty wide range of prices depending on product. Or you can have it shipped to you, depending on how much you're needing. For cutting acylic, best to use a table saw w/ a fine finish blade (60-80 teeth with 0 rake). A router or jointer will help with edge prep for welding acrylic together. As for bending you will need a heat element to heat the materials so you can bend it to a desired shape, and then allow it to cool. If you can be more specific in your project, I can help further.