Has anyone found a reasonably priced, simple, wireless alarm system 
for greenhouses. I have a vast tangle of wires and hokey sensors that is 
nothing but a huge pain in the ass. There are so many electronic gadgets 
out there, and there must be something appropriate that doesn't cost a 
fortune. The best I can find is the Watchdog system, but to do ten 
greenhouses is going to cost over three thousand bucks. Any ideas out 
there?   -Jake