I have the studio in a box, from Amazon its $71.24 which include free shipping and is a complete setup:
2 special white lights
1 foldable box w/ 2 backgrounds
1 camera stand
And when you're done it folds back up and everything is stored compactly together.
Before purchasing this, I ran across the same site you mentioned above. And I thought well heck yeah, that's easy to build and I can save some money, right?! Well, I did the math using his numbers, and it comes to $14.82, not $8. Still cheap, but you need two desk lamps, $10 ea but you'll have to wait for them to go on sale for that price (or cruise garage/yard sales..) and good bulbs for photography are not the 4/$1 walmart kind, I forget a reasonable price but lets say $10 ea might be in the ball park. And finally a small tripod for the camera probably won't cost more than $5. So what does it all cost? 15+10+10+10+10+5 = $60. Obviously that's less than $72 but you still have to put everything together and it's not going to be able to store itself very easily. So I opted for the little extra for a complete commercial solution. Now, I'm not trying to discourage you, infact, I'm glad you pointed this out, but unless you already have some spare lamps and what-not to be able to really save some money... well, it's up to you.
Regards,