Best place to buy DLP lamp?

[skybird]

I don't need one at the present time, but I know that day will come. I would like to buy a replacement to have on hand. Does anyone have a favorite "on line" place to buy, or is buying it from a local dealer about the same price? Any input from your experience would be appreciated. I have a Sammy HLN437WX/XAA. I understand it is a ultra high pressure mercury lamp.
Thanks