heres a thought, Radio Shack (in the commercial catalog) sells a pair of RS-232 transeviers for like 5 bucks each.
Not sure of the range, but wouldent it be cool to make one into a pager type device with the STAMP output going to the RS-232 transmitter sending an alarm signal to the pager? All Electronics sells a shaker taken out of a pager that could be used if you didn't want a loud alarm.
just a few thoughts.
share your thoughts with me on this.