The myth that DIY options aren't as good as products from a store goes far beyond tech purchases, but the idea that you'll get a better product from Best Buy than you can make yourself is just absurd.
Of course, making something on your own takes a little technical skill, but doing so can save you tons of money. One of the most obvious examples of this accessories. A car dock for your phone is a perfect example. You could go out and buy one for $30 or $40, and it'll probably only work for one specific phone. Or you can make one yourself out of binder clips for a couple bucks and it works with any phone. Even a laptop stand can cost $20 or $30 in a store, but you can easily make one yourself with a $3 Ikea BRADA that works just as well. Essentially, DIYing is not only cheaper, it also lets you make something that fits your exact needs.
DIY options are just as capable as their store-bought counterparts. Even if you're not sure what you're doing, you'll find a ton of guides online that walk you through the process to make your own gear. While your project might not end up looking as pretty as what you buy in the store, it'll likely work just as well and save you a lot of cash. The other benefit? You'll probably actually like what you make more than what you purchase.
Watch out for the last myth!!