For vegging you can get away with cfl's fine.. Craig's list etc isn't the only source of hps lights either.. It might be cheaper to look into electrical/lighting outfits like Westburne etc.. A few years ago I got 2 400W units with high-bay reflectors and bulbs for $90cdn each.. A trustworthy pump is a godsend with hydro though.. The cheap ones like to die quickly I find..
White paint (flat) is nearly as effective as mylar, and can easily be upgraded when affordable..
Depending on your strain odour can vary greatly, its tough to say how much you should budget for that..
As for hydro nutes, thats a catch-22 on a budget with the way they price quantities small/large, but if you're new to this I highly recommend them (same with the tds pen)..
You can set that up for $500 if you spend some time hunting..