Some pharmacies don't feel that it is their place to make moral decisions for their customers. The list, via Planned Parenthood, via They Get Letters, includes (and there are others I don't recognize as having Denver area locations):
Kmart, Costco, Supervalue Pharmacies and CVS Pharmacies.
I currently get prescription drugs at Safeway and Walgreens. But, given their policies, I have decided to cease giving them my business in the future. And, in addition to losing my prescription business, they will also lose my business for services like photo developing and incidental purchases that I often make on runs to pick up prescription drugs. I encourage you to do the same.