There's a shop in Lamar on the corner of Hwy 287 and Hwy 50, a shop a block north of the stop light in Syracuse, a shop in Garden City on Fulton St and a shop in Cimarron about 6 or 8 blocks north on Hwy 23. I don't think there's a shop in Dodge City anymore.
The shop in Syracuse is Quilter's Stash and is on the southeast corner of the intersection.
The shop in Garden City is a little more challenging to find. Get off the by-pass at the Fulton/Hwy 50 exit and instead of turning left to Dodge City turn right. The shop is a block after the third traffic light on the left. It's called Bar-K and it's in a building with other businesses. The shop in Cimarron is in a blond brick church building and it's called Country Dumplings.