Apple AirTags are the best Bluetooth trackers around, as long as you use an iPhone (Android devices have to use one of the alternatives). Now you can get a 4-pack of AirTags for just $74.99.
The Apple AirTag is a small device that emits a Bluetooth signal detectable by iPhones, iPads, and other Apple devices, which in turn can track and find whatever is carrying the tag. You can make it beep in the Find My app for easier location, and if you have an iPhone with a U1 chip, the Precision Finding feature can point directly to the tag's location (if it's within range).
Apple AirTags (4 pack)
With AirTags, you can get Separation Alerts for anything---anything you can attach an AirTag to, at least.
AirTags aren't just useful for finding nearby objects in your home. If you put the AirTag on something that leaves your home, and you happen to lose it, the AirTag will still report its location in the Find My app as other iPhones pass near it. That has made it a popular tool for everything from locating air luggage to finding the TV remote.
Apple has discounted its 4-pack of AirTags to $74.99 on Amazon, a discount of 24% from the usual price, which in turn is slightly cheaper than buying four individual AirTags at the usual $29 price. It's also on sale at Best Buy, though the discount is less significant, at $89.99.
The main downside is that you can only set it up (and track it later) with an Apple device, and there's no built-in hook or other mounting method -- you have to buy one separately. Still, this is the lowest recorded price for the Bluetooth tracker with the best network for finding lost items, since every iPhone in the world acts as a locater.