4 pack of 26 watters at home depot 1600 lumens each is 10 bucks. you'll need sockets, got any busted lamps or vanities with lights laying around? It's easy as hell to wire them together on an extension chord. If your going really small before flower, I would say the hell with the 5000-6500k spec bulbs, you would only use them for a week or two anyways, just get the 2700k's pack of 4 for ten bucks, that should at least put you into flower until u can afford some more. although i would recommend 100 actual watts per plant, if your going super small i guess 50 watts could do per plant? Seems hardly worth the effort though in my opinion.
Like the one guy said, it's extremely difficult to keep a grow stealth from other house occupants, its best to just see if you can get them on board before you really start.