The Sonoff Zigbee one is the go-to. Works extremely well with Z2M.

I've been using a CC2531 dongle, but that's a little DIY, being a bare PCB dongle that needs to be flashed with a firmware using a separate programmer cable (over, say, an RPi's GPIO). Back when I bought it, it was cheaper than a ready-to-go dongle and flashing it wasn't all that big a deal.

I like the Aeotec one, works well with home assistant. I also have their zwave dongle which similarly works well.