Yeah, the REI in Anchorage is great. At the last minute I bought an MSR Zoid 1 from them that was missing a D-clasp. (Yeah, I didn't find out til I was on the trip, but it wasn't a biggie, definitely a no-no though on my part) Anyway, on the way home, we stopped back at the place in anchorage about 15 minutes after closing time. The man at the cashier literally opened the store again and went and found a person in tents and even went so far as to take a D-clasp from another MSR Zoid and put it on mine. Great service and they're pretty knowledgeable.
I've been to Campmor millions of times, EMS, the Mountaineer in Keene.
As far as online, I've actually gotten decent X-C skiing advice from backcountrystore.com via their live chat. But like mentioned, don't expect service on the online stores.
Jay