Cheap and ClearCom never go together. Even on the used market ClearCom is expensive. Of course your expensive and someone else's are totally different. Anyway, I don't know about connecting it with a ClearCom
system, but I have ditched my ClearCom all together for Murmur (free server side software) and Mumble (free client for PC,
Mac, iOs, and Andriod). In a school you may already have the infrastructure in place, otherwise a wireless access
point or two, a
Mac or PC to run ther server software and a cheap smartphone that most high school students have anyway and you have wireless duplex communication for little to no cost. You can also
purchase a hosted solution to span multiple venues for a low price.
I have run the server software of both a PC and
Mac running in the back
ground of my sound
cue computer on hardware that is going on 8 years old and had no problems with 10 + users connected and less than 6ms delay. I typically have my wireless password protected, however, it is usually not connected to the intrernet This means no web browsing during a show, which I prefer.