Pretty good price, probably because it can be quite an effort to get it going with Home Assistant.
If you have a lot of 433Mhz devices lying around because they are obsolete, you can probably re-purpose them with this bridge.
I got this alarm system a while back. https://www.ozbargain.com.au/node/219654 Not the best, but found that I can "pair" the PIR sensors with this bridge.
Also, note that this bridge can only receive, not transmit.
Hi geek001 why do you think the 433 stuff is obsolete? I run a couple of 4 channel pros and use 433 switches as a backup to Google home.