http://www.hayloftfabrics.com/
This store is WONDERFUL! Nothing is price over $7.99 a yard and they have everything and a lot of it. The people are so friendly and helpful and when you finish shopping you can get a fabulous root beer float for $1.29 This store is in Morgantown, about 25 minutes from Denver. Also, everthing is 15% from now until July 31.
I also like Martins Fabric Barn in Lebanon.
http://www.quiltart.com/fabricbarn.html
They have good prices, but the selection isn't as big, but I think they have very high quality fabrics. Also, they have a cute craft store upstairs and all aroundthem are cute Amish stores. This store is run by Menonitewomen/girls and they are so sweet.
I hope this is helpful : )