In Denver, check out Lee Kinney, The Custom Foot, 303-761-4002. He used to be based out of Mtn Miser, but since its demise he's now got his own space on S. Broadway at about Dartmouth. He's been in the biz for a long time and does fantastic work, no matter your issues with your feet. He's great about adjustments until you are happy and pain free. Make an appointment, he books up 2-3 days in advance.
In Boulder, try Neptune Mountaineering, 633 South Broadway Suite A
Boulder, CO 80305, 303.499.8866 and I had good luck getting my son fit (size 14+!) at Larry's Boots, 2709 Spruce St, Boulder, 80302 - (303) 402-6733.