If you listen very carefully at the end of the above video, you will hear Kent Rollins name the outfit that he likes:
Their site does not show prices, you need to ask for a quote. I'm not going to bother them unless I get quite serious.Ellis Canvas in Durango, Colorado makes very expensive tents of this sort. Their 8x8 "Prairie tent" sells for 1695 and the 10x10 version is 1895.
Sheridan Tent and Awning (in Sheridan, Wyoming) sells a Cowboy range tent and teepee. Their 9x9 tent with 12 oz canvas sells for $819
Big Bend Saddlery in Alpine, Texas offers a 9.5x9.5 Range Tipi for $1522.50 The tent has a vinyl floor and it looks like they make them when they are ordered, so there will be a wait.
Tom's hiking pages / tom@mmto.org