local hydroponics shops

[Delphinus]

Although it's always worth checking into, it's somewhat doubtful to find much in the 175W size at the hydroponics stores. 175W is of limited use for the plant growers -- they like 400W and 1000W usually. You mmmmight be able to find 250W ballasts if you call around. The reason I got such a good deal on the 250W ballast that I purchased was that none of the plant growing buyers were interested in it, thus the store was really all too happy just to unload it when I called and asked for one.