Advice on trustworthy audio resellers who check condition, offer trial period?


I'm wondering what resellers you find reputable for your purchasing. I've made three purchases with Tmraudio.com (The Music Room) in Colorado and they've been great. They guarantee their items work, have a 14 day trial period, and an easy to navigate website.

What other sites do you know of like this — not just that connect sellers and buyers, but that take in used gear, test it, rate its cosmetic condition, and offer a trial period? (I'm a bit wary of buying, say, an amplifier of $2k only to find it's not what it's supposed to be.)

This could be a general site, like The Music Room, or just a store that does this (good selection, prices, trustworthy, and trial period). Thoughts?

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Like many others (including hifihandyman above), I've had good experiences dealing with Echo Audio in Portland, OR.
On a *very* tight budget and all of my purchases have been with TMR.  Honestly amazed at the system I have been able to put together.
Upscale Audio sells used on their site.  I have only bought new from them in past years, but their service and support was good for me. 
I just purchased an SP-6 preamp from Echo Audio in Portland.  The protection circuit failed and my local shop repaired it. 

I sent a copy of the invoice and a pic of the 7 replaced parts to Echo and my card was credited for the entire repair right away.

Excellent attitude and great service.  The pre-amp sounds wonderful on my Maggies, replacing a Luxman CL-32 that finally failed after 40+ years (channel gain imbalance that is evidently not able to be fixed by Luxman).