Highly recommend going to Harriets store. Used to be fabric store of choice after the great american quilt store closed down. Have fun and welcome to Colorado

I have a small piece that is cotton, I'm not wanting to part with it though, but the selvedge says this on it: Major League Baseball trademarks and copyrights are used with the permission of Major League Baseball Properties Inc. Fabric Traditions @ 2000 copyright N.T.T. Inc. I don't know if that would help you in your search or not.

I see there is a small amount on ebay and etsy of the same cotton fabric and it is now out of print?
http://www.ebay.com/bhp/colorado-rockies-fabric

I'm headed to Golden, CO tomorrow - will have to check out the museum.

Check out this site: http://www.quiltinghub.com/ It is a quilt shop locator.

"Snappy Quilts" has the most beautiful colorful fabric I've ever seen. They're at 2500 E. Orchard Avenue, on the southeast corner of University & Orchard.
"Holly Quilt Cabin" is my closest favorite. 8210 S. Holly Street, on the northeast corner of Holly and County Line Road
"Fabric Expressions" is really nice but is far from me and I rarely get over to that part of town. It's at 3625 W. Bowles Avenue #13 in Littleton. It's probably the closest one to where you'll be (that I know of).
High Prairie Quilts, that another member mentioned, is another favorite, but they are down in Parker way south east of town.
Have fun!!!

Holly's Quilt Cabin is my favorite quilt shop in the Denver area, I haven't made it to Snappy yet but am anxious to give it a try. I live out by Denver International Airport and still love going to Holly's. The Quilt Store is north in Broomfield (on Lowell) if you're out that way. B-Right-On in Brighton (NE - Hwy 85 and Hwy 7 round-about) is a great shop too and ALL their fabric is $9/yd including batiks except for the wide backing fabric and Shop Hop fabric, and its all first quality LQS fabric Moda, etc., etc. great price on panels too. Enjoy and welcome to the Denver area.