Montana is BEAUTIFUL! Go to Seeley Lake if possible there is a great quilt store there. Also if you get south to the Bitterroot Valley there is a wonderful quilt store in Hamilton called Patchwork Quilts. ( Patches) In Missoula there is Timeless Treasures and Quilters Quarry also Julies down Under. Sorry I don't know about quilt stores near Glacier Park.
Big Fork Bay Trading Company is great. Enjoy tour trip,