Just bought a FOUR PACK of tile!
First post, so sorry if I do something wrong.
Normally a 4 pack is $60-$70, even on Amazon.
Attach the "tile" product to keys or wallet, and if they ever go missing, you can use your smart phone to make the "tile" sound off, (and possibly vibrate?) as long as it's within 150ft, (45 meters).
Very useful if you lose things a lot!
Found it at my local RiteAid for 75% off, ($45.00 off)