Pretty much any mains powered Z wave device will act as a Z wave repeater except for some smoke detectors. And the same thing for mains power zigbee devices to act as a zigbee repeater. That includes light switches, in wall outlets, in wall micros, plug in pocket sockets, plug in sensors, even zwave light bulbs for zwave or IKEA Tradfri Light bulbs for zigbee. So you’ll have lots of choices.
See the following FAQ. Start with post 11 in that thread, then go up to the top and read the whole thing and you should have a good feel for what you need to do. ( this is a clickable link)
The one device class which is a little tricky is ZIgbee lightbulbs. See the following FAQ:
As of this writing, the least expensive zigbee repeater in either the US or the UK appears to be the new IKEA Tradfri pocketsocket. You can’t beat the price of $10, and while we can’t know long-term reliability yet because it’s new, it appears to have decent engineering. It’s just a little big, so you can’t stack two of them in one outlet.
A lot of the initial bad reviews are because people were expecting it to work with apple’s HomeKit, like the rest of the tradfri line, and it doesn’t yet.
But it does seem to work fine with smartthings and, like the bulb, is one of the few zigbee repeaters that seems to work well with the Xaomi sensors. So if you just need a simple on/off device, it’s certainly worth considering.
