How big of a tent do you need?
I just purchased a new cheap tent on Amazon a few weeks ago. Its pretty decent size at 60"x60"x84" for $135ish. I noticed this size tent has thicker heavier nylon compared to the smaller tent.
When I have the 1000W MH light on and its zipped I can see a few pin-hole light leaks at the seams. However on the inside I can't see any leaks when the bulb is off.