i have to disagree on putting 2, let alone "1.3" in there.
2x2x4' is good space for a single male. 2x2x6 he will be plenty comfortable.
Agreed
I would not put 2 in a cage of that size. I currently free-range 2 (a female panther and male jacksons, so breeding isn't an issue) in a 3'x3'x8' free-range and based on their behavior I find it barely acceptable. I used to house 3 in the same (3x3x8) and they would constantly show stress and leave the area. It didn't work too well I had to remove one.
Agreed
On a side note, if you are concerned with finding a bunch of "cheap" chameleons, I think you are starting on the wrong foot in this hobby. Just my 2 cents.