Honeywell sensors

Honeywell makes low cost wireless door/window sensors for alarm systems - reed switches with batteries that last 10 years.

Has anyone been able to find some sort of RS232 (or something else the Arduino can interface with) receiver for these sensors so that I can build my own home security system?

The words Honeywell and low cost and wireless don't sit too well together. Have you got a link to these sensors?

Ok so maybe I'm wrong on the low cost bit :)...

I'm talking about these:

It seems that these are what most home alarm systems use.