looks like mine might be getting a little pot bound, i have only used 4 litre pots
This is what I used for the below plants
vegging CFL's, flowering cfls, nutes, ph up, ph down, ph meter, various pots, soil, mylar, fans, sockets, socket adapters + a few more - all came to like, $150-$180?
You can grow with $50, but it will be annoying as fuck improvising stuff. It's much easier to spend the $ and do it right.
btw I was using 8x 26w 6500k bulbs for half of vegging (worked my way up) and I used 6x 42w 2700k cfls.
1 of those 42w 2700k CFL's at Home Depot costs like $7.50, I bought 8 total (broke two). I spent $10 more than your budget on flowering CFL's alone.
Your going to need nutrients @ like $10+ a bottle, and some good soil @ $10 a bag, and a ph tester for $25.
My advice is don't start growing before you have everything you need. Otherwise your running to the store to buy things with money you don't have. But you figure you already invested so much time and $, so it wouldn't make sense to abandon your plants. Besides, you will be in love them.