“Zzh!” (short for “Zig-a-zig-ah!”) Zigbee USB-stick/dongle/adapter by Electrolama (open-source hardware licensed projects by Omer “omerk” Kilic and friends) is now available for purchase for $35 via Tindie.
Based on the Texas Instruments CC2652R (a.k.a. CC2652R1 / CC26X2R1) MCU radio chip this can be seen as a much more powerful radio and Zigbee 3.0 capable replacement for the popular CC2530 and CC2531 Zigbee coordinator USB-sticks/dongles/adapters.
More detailed information is available on the project page at Electrolama:
Zzh! (Zig-a-zig-ah!) design is released as open-source hardware licensed under the Solderpad Hardware License 2.0 with its PCB schematic source files available in EAGLE format on GitHub, meaning that if you have the skills you can help the community improve the hardware and/or build your own adapter.
Z-Stack 3.x (Texas Instruments Zigbee Stack) based Zigbee 3.0 coordinator firmware already available for it from the Zigbee2mqtt project makes it already compatible with the Zigbee2mqtt gateway with Home Assistant (as well as with other home automation software such as IoBroker, Domoticz, and OpenHAB).
There is also initial experimental support for it in the native ZHA integration built-into Home Assistant (which is compatible with many different Zigbee adapters from multiple manufacturers, without Zigbee2mqtt).
It should be highlighted that while both Zigbee2mqtt and the native ZHA integration in Home Assistant can be generally be considered stable, the newly added support for this and other types of Texas Instrument CC chip-based Zigbee adapters to the native ZHA integration is still experimental thus not yet stable so I would only recommend these dongles to developers wanting to help the development of the native ZHA integration or experiment right now.
Note! I have no direct or indirect affiliations with this product or any of its manufacturers/parts.
PS: FYI, I read on the Electrolama project page that Omer Kilic also has plans to design an even more powerful version (nicknamed " zzh-p") based on the most costly CC2652P chip which CC2652/CC26X2 radio chip has an integrated PA (Power Amplifier).