Check the phone book if there is a Brite-lite store in your area ... the ballast and starter should run about 70 - 80 bucks ... a mogul base about 10 bucks or less ... I have had the local hydroponic shop bend 6 ft long reflectors out of spectral aluminium for 90 bucks or less ... if you are looking for a reflector just for that MH only it wont cost half that ... and then a stop at Home Depot for wiring and plugs
Putting it all together is not so bad ... the ballasts have instructions right on them as far as wiring goes ... you can use a metal toolbox or similar to house the ballast ( I have a tank room so ballasts are mounted to the wall with just the cords going to the hood )
Good Luck