Last complete one I bought I paid $325 and it was a steal. Last 2 on ebay before that went for $375 and $400! Prices have jumped in the last year. That's ridiculous! I've thought about making them but no longer have access to casting equipment. By the time I had castings and the stampings made, it's cheaper to buy a used one. I've bought entire junk bikes just to get the recoil parts.
You CAN do without and still ride to your hearts content. I do that on one of my bikes. Take the magneto cover off and wrap a recoil rope around the recoil cup, wedging it into the joint with the magneto, then around a few times over itself. Wrap COUNTER CLOCKWISE! I use about a 3' rope with a std mower T-handle. Once started, I fold up the rope and tie it around the handlebar base and sit the handle in the pocket behind the headlight. You always have it with you while you ride. Easy peasy!
If you want to keep the sprocket cover on, I've seen people adapt a common aluminum V-pulley or make spacers to hold the cup further out. Just get a second cup, flip it over as a spacer, then use longer bolts.