42w's used to be relatively available; but now i only find 26w at walmart; but if you go to walmart, get yourself $6 utility clip fixtures and get a deal on a pack of 26w'ers (100-equiv.) you should be doing pretty well

"cool white" is best for veg; "warm" for flower, you may only be ablle t o get "soft"; "soft" is WARM-ish and not best for veg, some folks avoid it completetly, not sure why, puts out standard lumens, and are usually cheapest by far