A lot of the parts are used in quantities of 1, 2, or 3, but if you look at the Mouser site, they are cheaper in quantities of 10, like resistors. They run 0.11 for 1 or 0.46 for 10, my thoughts are why not have the extra parts on hand. Also, most of RJ's designs use the same parts, so while saving money per item, you also have a head start on soldering the next project. Here's a few pics of what I do.