it depends on multitude of factors. weigh them check the current price of alloy and that's your minimum. then it depends on whether they are straight or warped. it depends on the condition of the sealing bead for the tyre. and the oval ness of the rear brake liner. then the condition of any bearings, if all are good and the rims are sound and usable.
have a look on E-bay for what others are selling similar rims for. there is no definitive answer. ball park guess $10 to $20 bucks a rim. look at availability you could get more if there the best on the site and seem to be rare.
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