I bought one a few years ago off of HTG supply, I think they are in California. They shipped to Canada pretty much for free and it was pretty stealthily packaged.
bustan.ca in canada they have sunhut and darkroom. i got the 4x4 sunhut badass with a 1000w light and your blinded when you open the thing its so bright with that reflective material thry use.
there was a guy from Hamilton on ebay selling them for $125 for a 4'x4'x7'... I have two...reflective inner lining.... not bad quality... there are a few things, but nothing major... no off gassing... dunno if he is still there, but worth the check out.... for the price its pretty good... he may be paypal only... not sure if that works for you or not...