I would do various member searches on here using Englewood, Denver, Castle Rock, Littleton, Highlands Ranch, Aurora as part of your search and ask them through a "PM" for shops in their area. It seems several of the ones suggested here are far north of Englewood (I lived there 20 years ago and know they are far from Englewood). I used to go to Denver Fabrics but it was in the northern end also. I'm sure all of the places I went to are gone or moved. I'd also "goggle" it and that will give you a good starting spot.
Good luck and have fun.