Deer trail monitors

[Bad Wolf]

I while back I found someone who was selling a relatively inexpensive trail monitor. It had 3 sensor/transmitters and a receiver with LED's. Now of course I can't find the link.
I'm constantly swiveling around trying to watch over my shoulder also it would give me some warning that something is coming down the trail before I can see it.

Anybody either use one of these and/or know where to buy one?
The only one I've found so far is SWFA Spypoint but that's kind of pricey. I seem to remember the whole set up for under 50 bucks.

Thanks

 

[Fifelaker]

Years ago on a "road" going into a hunting spot an older guy set on the side of the road looking east with a mirror in front of him looking west. We giggled alot but I don't know why it wouldn't work . Just a thought.

 

[Backwoods Savage]

Greg, you could also buy a mirror that you could clip on glasses or your hat in order to watch behind you. If you have a blind, then you could also mount a mirror on that so long as the sun did not hit it. Put camo tape on the back of the mirror.