Here are useful links to companies that provide good service for projector lamps and some not so good service. There are other useful links as well regarding the purchase of projectors and lamps..

www.projectorcentral.com/projector-lamps-faq.cfm
This site offers a great wealth of information on projectors in general, a site to bookmark!

http://www.projectorlampcenter.com
The Projector Lamp Center out of Atlanta treated us very poorly! We ordered a lamp for overnight delivery for an event in which we needed a projectcor in service. About 3:00 the next day while we are loading out for the event we nervously called the Projector Lamp Center to inquire about when the lamp may be arriving. Well the person that took the order evidently had looked at the wrong information and the bulb was not even available for shipping. That would have been OK had he been thoughtful or courteous enough to call and inform us of the mistake allowing us to make other arrangements, they did not, we had to rent a projector. They have not credited our charge card and it's has been seven days. This is not the first problem with this company, we have filed a complaint with the BBB, we should have known better.

Unfavorable reviews Projector Lamp Center: Jan 2008

www.donsbulbs.com
Great reliable company, costs a little more but worth the comfort of knowing you will be treated as a professional by a professional.

www.purelandsupply.com
Another great source for projector lamps !