I took a trip to Colorado and Utah August/September this year. I need to hear gear before I purchase.
One place I stopped by, TMRaudio.com in Eric, Colorado, they sell new and used gear. TMR also has an excellent return policy. They do an awesome job of testing and validating used gear before it is listed.
Many of the stores I visited on that trip, list used gear (like demos with warranties). This is how I find stuff. They also list trade-ins and gear on consignment. You can contact dealers that sell gear you like and let me know what you are looking for.
Just like buying vinyl, you have get down and dirty in the bins to find the hidden gems. I have been looking for the Treo CTs for many years.
I was looking at The Music Room email for some of the gear I heard on my trip. They listed a used Simaudio Moon 700i (SS, 1/3 price) and a used Vandersteen Treo CT (1/2 price). They were listed a week or two apart. Each was purchased the day I saw them, neither goes on sale very often. Simaudio Moon has new gear coming out, someone upgraded, so I was lucky. The Treo CTs are very seldom available used. Both pieces are at my house now.
Thank you TMRaudio.com! (I do not have any relationship with TMR, other than a happy customer.)