If you need to go wireless, then your best option is probably the Optex VX-402RI PIR with Inovonics transmitter, and the Inovonics EN4204 receiver, or if you need relays, then the EN4204R. You should be able to get the PIRs for about $170 each and the receiver for about $120, more or less.
Best,
Christopher
Hi, I know this thread is old but just gonna ask: after I read the manual for EN4204 and 4204R, the R version has Form C relay output which can be easily connected to a DVR. How about 4204? Can it be connected to DVR? according to the manual, it has Collector Output? What exactly is that? The reason I ask because the 4204 is cheaper than the R version.