It's a normal price. What are you lighting? You probably want a hobby grade lamp, and not an industrial grade lamp as you have there. the color won't be what you want.
These are more geared towards what you probably need-
175 Watt Single-Ended Metal Halide Light Bulbs
I see your signature states a freshwater tank and a FOWLR
. Neither of these need metal halide lighting. Unless you have photosynthetic creatures, you might want to skip the halides all together and save the $$ on the electric bill.