For in-store pickup only, Micro Center offers the Tile Slim Bluetooth Item Finder 4-Pack for $22.99. That's $18 under our January mention and the lowest price we've seen. (It's $51 under the best price we could find for four elsewhere today.) It creates an audible alarm at the push of a button, allowing you to find any item it's attached to. It can be tracked via Tile's iOS and Android apps.