I have a CTX EzPro 580 projector and need to know where to get
replacement bulb online.

Hi! Thanks for the question.

Here are some online stores wherein you can buy replacement
lamps/bulbs for the CTX EzPro 580.

Focused Technology
http://www.focusedtechnology.com/optoma-580-lamp.html

Sales Stores
http://store.salestores.com/opsprelaforc.html

Projector Zone
http://www.projectorzone.com/ezpro580lamp.html

Projector Lamp Center
http://www.projectorlampcenter.com/detail.aspx?ID=1289

Supplies USA
http://www.suppliesusa.com/item.asp?lst=8935&v_article=7036&hist=B&AF=googdplop&shoid=DQR1N5CC30&show_h=1

Projector Express
http://www.projectorxpress.com/shopping/shopexd.asp?id=859

Data Drive for All
http://www.datadrive4all.com/prod.cfm/103676/EZPRO580LAMP


Search terms used: 
"CTX EzPro 580" replacement lamps bulbs

I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
                 
Thanks for visiting us.                
                 
Regards,                 
Easterangel-ga                 
Google Answers Researcher

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Clarification of Answer by easterangel-ga on 20 May 2005 12:35 PDT

Hello!

I was able to find one more online store.

Cost Central
http://www.costcentral.com/proddetail/Optoma_Technology_LCD_projector_lamp/SP80507001/209209/

Thanks for the 5 stars!