If you plan on homebrewing any amateur radio or other electronic gear, or even doing minor repairs, it is extremely helpful to have a well stocked "junk box" of components. If you don't have one already, it's easy to stock up on a large supply of the necessary components you need. If you don't have a local source, you can actually order a lot of good component assortments on Amazon. This page contains links to some of them. Most of the items on this page qualify for free shipping. Therefore, if you're going to do experimenting or homebrewing, this is an economical way to have the parts available.