Just for fun I looked up the last three pages of the Gear For Sale at BPL, the most likely place where to find TTs for sale.
Glenn is indeed correct when he states that there are a lot of them for sale, however I see a maybe different slant to it than he does.

All tents for sale from the latest to the oldest ...
1)TT DR $ 200 sold in 1 day (needed the money)
2) Go Lite Hex +Kifaru stove. New $700 asking $450 not sold after 4 days
TT Contrail $105 sold in 2 days
3) TT Cloudburst $165 sold under 2 days
Mutha Hubba $260 as new unsold 2 days later
MLD 07 tarp $80 unsold
Go Lite Liar 1 $40 unsold
4) TT Sublite $125 ($159 recently from TT) sold in 3 min
5) Stephensons Warmlite 2R (new) $350 inc from $556 retail. Sold in 5 hours
6) TT DR $200 sold in 3 hours
7) TT Rainbow $135 sold in 22 min
8) Hilleberg Allak (used once) $545 inc from $670 retail. Unsold 18 days later
9) MH Waypoint 1 as new $90 ONO, unsold 10 days later

I omitted some tarps from this list except when for sale with other shelters as in post 3
Franco
Grumpy Gord
I haven't seen many solo tents with more usable space than a Rainbow or a Contrail, but some will find thje DR a bit small.