The cheapest answer is probably going to turn out to be a replacement wheel from your local bike shop.
Bicycle wheels, despite being light in weight, are fairly pricy to ship. You say it's a cheap bike that you have been generally satisfied. That means it came with ordinary factory built wheels. A replacement wheel from a bike shop will match what was there before and that you have been happy with..
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.