600D tents are about the min you want to go. I get mine usually from growlights.ca because they are about as cheap as amazon and free shipping etc.
2 x 2 tents come 4 feet tall. next step up is the 20 x 36 x 62 inch (And various other tents right up to a 5 x 5 x 62 inches).
Then you get into the 6 1/2 footers. Jardine makes all kinds of sizes but they are stupid expensive. Probably great but i was too cheap for that.
I find the 20 x 36 x 62 is a great all rounder
but they fit in my space like a glove.
And a 600d will rip all to shit if you move it around a lot....you have to go to the 1680D which is really nice but it starts at a 2 x 4 or a 3 x 3 and they usually go to 7 feet tall.
Growing inside.....its in TENTS !
Chinese tents are made in metric...that the reason for the stupid sizes and why north american tents are made in actual feet. like a 2 foot tent is 24 inches
2 foot chinese tents are 60 cm square
my 2 foot square one they subbed it out for a 32 1/2 square one...and that fit a lot better (80 x 80 x 150 cm)