I made a simple one out of a pill timer (I like that it's kinda bulky, makes it easier to find and use in the dark), like this one I got for $5 at wally world or somewhere (radio shack, maybe?). Runs on a couple of AA batteries. I disconnected the little speaker and ran a scavenged power cord to a couple of red LED's, which I sewed into a sleep mask. Crude, but it makes it so you can set the timer to go off in however long you want (like, say 5 hours). Oh, and I think I put in a potentiometer to make the lights brighter or dimmer.
The downside is that when it goes off, it "beeps" (leds flash) for about 30 seconds. You can't change that. Then it goes off every 15 minutes until you reset it, which works out pretty good for dreaming. I have gotten a few cues from it over the years (saw flashing in my dream), but never a lucid dream because the flashing just keeps going on and on (30 seconds seems like a long time), and I wake up. It does make me consider shelling out the bucks for a real one, though, that detects REM, and can be set to stop flashing at a certain number).
This is a good $10 option, though, if you can solder together a couple of wires.
the pill timer is something like this (mine looks different): http://cgi.ebay.com/New-LCD-4-Square...item2a0414bcf5
the sleep mask is an ordinary one, found everywhere: http://www.amazon.com/AquaBella-Slum...3951359&sr=1-6
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