I'm looking for beepers. I know Prat has a good one and I've seen the one
>from Transolve. Are there any others? These can't be the only two on the
>market. Help me out here. Does anyone know of other manufacturers?
Depending on the size of your rocket, you don't *need* a 'rocketry' beacon... a personal alarm can be rigged to be put in 2.5" or larger airframes.
Alternatively - if you have even the meagerest of soldering skills, one can be built reasonably cheaply. A flashing LED, a piezo buzzer, and a battery are basically all that are required. I built one with a
556 dual-timer IC, because I wanted to send an audio tone to a radio transmitter, but it's not *really* required.