Now that internet merchants charge local sales tax in my area, the playing field has been leveled with local stores, and the winner is the one offering better service.
I periodically check into the flagship store of Mike's Camera in Boulder Colorado, and for mainstream items, prices are generally competitive. Most recent purchase of note was my Sony A7R4. You can definitely be waited upon like in the old days, with the staff bringing out item after item for you to peruse. But I generally have done all of my own pondering and agonizing long before ever setting foot in the store, and my own visits are pretty focused.
For old parts cameras and camera parts, there's The Camera Trader an hour's drive away in Englewood, but since he has an eBay store, I just have him mail stuff. I should ask him whether he had some connection with the old National Camera + Camera Craftsman magazine.
For other items not readily available locally:
+ Robert's Camera, definitely a welcome new presence
- KEH seems to have declined a bit IMO
- eBay, still a biggie, but I've become more of a seller not a buyer there. High UK shipping prices, but shopping in the ex Iron Curtain can be a pretty good deal.
- Amazon: Who knows when they will actually ship items anymore
=Adorama, B&H: Still pretty solid in my book