ya u can check out the prices at htgsupply.com as james said. i got my 2x 600w ballasts for $50 from a guy who didnt have any use for them and my bro got me the 400w hps bulb which would normally go for around $30 at home depot. ballasts are the most expensive. and ya, hps is a type of bulb and mh is a different type of bulb. they look very similar tho.