I'm in downtown KC, but over in Oldtown Lenexa KS I know of one shop that buys local artisans and crafter's works (they are rather selective and marmish sometimes though!). It's called Retrophilia. Maybe you'll like them, but if you don't they would at least be a good place to start looking for other shops! I just moved here so I'll keep my eyes peeled for other locations!
Here is there website: http://www.retrophilia.com/
Wuv and hisses,