I just had my tail position light burnout on my Whelen A500 unit. Spruce and Sky Geek want over $20 for the A508-14 replacement halogen bulb. After scouting around on the web, I found a couple of sources.
This link shows a supplier that has them for about $10.
http://www.bulbtronics.com/technolog...-erc-1991.html
My bulb burned out at about 200 hours, which was right at the life limit stated.
Here's another source that supplies them for about $4, but has a $25 minimum order.
http://www.atlantalightbulbs.com/eca...roductCode=ERC
I know the savings numbers are dwarfed by the outsized cost of many of the items we use and I'm not that much of a cheapskate, but paying over $20 plus shipping for a small, flashlight-sized bulb just annoyed me, so I got 4 bulbs and some D-cell batteries from Atlanta Light Bulb for what Sky Geek and Spruce wanted for 1 bulb.
Mike