Check with your local shops. Sometimes you can find a 1k $250 mag ballast, hood and bulb combo for 250. I did. Will still need a fan/filter for that kind of set up though, online can find a fan/carbon filter set up pretty cheap. The down side is its a pretty cheap fan and filter. I used my first fan in veg area after I was able to upgrade. Keep upgrades in mind when you buy now.
Honestly, you just need enough to get a good yield on your first grow and the discipline to get rid of almost all of it to finance the rest of your equipment. There is no need to buy cheap this round, only to have to rebuy better stuff for the next round. IE... dont buy a shit light now, just so you can buy a better light later. Real equipment costs real money, but grows real smoke. CFL/ T5 might get you by for your first run, but real meds need real light. Live off Top Ramen for a week if you need the extra cash, its worth it.
Get the filter. Raw, growing weed smells so much different from smoked weed. With no filtration, being in the hood, you will attract "roaches"
You're off to a good start though. the girls look pretty good.