Originally Posted by
HTupolev
...Basic reasonable rims can be had in the ~$30 range. Fancy aluminum rims can get into the ~$200 range. Decent round spokes and nipples tend to run a little over $1/spoke, although nice bladed spokes can be over $3/spoke.
Alternately, it's frequently cheaper to just buy a new wheel... You'll want to check hub adjustment and spoke tension on any wheel that's not made carefully by a good wheelbuilder, though.
You usually don't need new spokes and nipples to replace a worn out rim. It's pretty easy to just swap out the rim. If you do need new spokes, they are available for a lot less than a buck a spoke.