Is there some instructable for this? Basically, just a penny sized sticker that can be placed on any item. If lost, then a device could easily scan for them (5 feet radius range, maybe) I've searched for systems like this, but they're all expensive. It should be pretty simple, maybe passive RFID tags, and some kind of device that detects if it is closer or farther. I've checked on reader, but any cheap ones are in the $160 range and 3 inch distance. Long distance ones are like 500 and above. Except readers aren't really necessary. There isn't really any information that needs to be read. Just a way to tell if the signal is closer. Something like that could probably made in the $20 range but i wouldn't know I'm asking cause I lost the memory card for my camera (case and all). It was sitting on a desk, then it wasn't. It had some vacation photos that i hadn't transfered to PC yet. It was a grueling search, and I couldn't find it. At some point in our lives, everyone needs something like that. Losing something important sucks, expensive or not.