You can get the stuff for under 100$ easily, even build it 4x4x6½ for under 100$. Don't get me wrong buying a tent isn't a bad idea, but if your building something you'll pretty much be able to say "yeah I built that shit," and you'll have a greater understanding of how making that stuff works. Sooner or later you'll be able to design your own 10x10x6½ with split rooms for veg/flower and you'll feel so fucking good about it, then you'll have your plants inside to top it off. Imo building things is really fun, if you pay someone to mow your lawn I could see why you don't wanna build it.