You could buy the tools, wood and glue to make these along with a big steak and cash in your pocket for the price of elite rings. Plus you would have the tools afterwards. These won't take you more than an hour or two to produce. You may want to make 3 rings if you're new to using a jigsaw. I used a router to round the edges but a rasp would do the same work. Wrap with tape and get to work on your MUs.
Don't misunderstand, I have used and like the elite rings and the power rings. I would just rather put my money other places right now especially since I had the lumber, tools, and ability to begin with.