Not sure if this is the correct place for this post, but I was wondering if anyone knew of any good detailing supply stores in or around Kansas City, Mo.
I bet a good way to start would be the Meguiar's dealer locator. Look for the places that sell their professional products. I'd assume that stores that sell the Meg's pro-line will also have a somewhat decent selection of other brands, but probably not a lot of the boutique products mentioned around here.
It also depends on what you mean by "detailing supplies." You local Harley Store will have S100 Wax, wheel cleaner, and paint cleaner. Those products, in addition to being inexpensive, are on par with most other "professional" products.