Over the 20 years of running Tunze USA, I have typically sold the handful of refurbished, demo and discontinued items when we have them either here or on Reef Central. This tends to be awkward and difficult to manage. We are trying something new and now we send these items to someone I have known a long time and really trust and tends to be an expert in used equipment as well as a grower of some very nice corals who I have used for some of my own livestock. Jose Serrano, Always Tanked, ataquariums.com is who will sell such items for us going forward, and I would suggest if you are looking for any used equipment or even some nice SPS frags, give Jose a try. I include a pic of one my favorite acros that I got from him as well, his corals are always healthy and very fairly priced. The purple tipped green acro next to the sunburst cap is one of my favorites as it grows very quickly.