Damn, didn't realize that they were the only source. Mine is in ok shape but I was meaning to pick up a spare.

If you are serious about reproducing the reel cover plastic, you might put a call out to other people who are interested in buying one. The more potential customers you have could seriously reduce the unit price (plastic stock, tooling, art etc). I myself would take at least one and maybe two depending on the final price. It's a really fun game and definitely worth the effort to keep it going and looking good