What is? Estimotes? They’re mostly used by stores, but the price isn’t terrible. The regular line, now called “proximity beacons” are three for $59, so about $20 each. Those are the ones I have.
The “indoor location UWB beacons” come in a set of four (not three) for $159. Those are intended for commercial use. You need three or four per room to define a room so they would get to be very expensive for home use. They’re intended for a department store where someone walks from sporting-goods to men’s clothing and the store wants their app to show different featured items depending on where the person is standing. Or a museum which wants to pull up different information depending on which exhibit you’re standing near.
“Stickers” are 10 for $99, but these are much less precise than the other models. They’re really intended for things like “the bicycle arrived home.”
Estimotes can be used with any Ibeacon receiving station software.