It depends on if you want new or used. New ones can possibly be ordered, I'm not sure... if so, I'm sure it depends on what style you're looking for (aluminum, steel, etc). Typically it's $8 for a used rim, front or back.
Usually under $10 for a 20" rear wheel. A steel rim would be closer to $5.
Depending on what you want between 10 and 20 for used
Not sure you'd have to call and ask them I'm sure can be more than $10
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