If you are so inclined, you can DIY a pendant for much less money than you can buy one. Other than that, check out the hydroponics stores - they usually have the cheapest MH fixture prices. You will need a better lamp though.
For lamps, generally speaking, as the color temperature goes up, so does the cost. Except for the 12KK lamps. The Iwasaki lamps offer the best PAR/watt and the AB or Ushio 10KK lamps offer some of the best color. BUT, it does depend on who you talk to and what YOU are looking for.
-Tom