If you don’t want to waste money on some fancy computer cable organizer you need to come up with a some solution by yourself. Here is a project you can do in 20 minutes without spending more that $3.
You need to buy a plastic container in a container store or in IKEA. Drill holes in the top of this container for air flow and holes on the sides for cables to pass through. At that point your computer cable organizer is pretty much ready. Just pack everything inside and close the box. Your computer corner will be much less messy after that.