As of 10 JAN, 2024 Amazon USA has a $40 off coupon for the Aqara U100 Smart Lock (dark grey and silver). This was the official Aqara listing. Just click the coupon button before adding it to your cart. The lock is regularly $189.99 USD but with the coupon and free shipping is $158.99 (6% sales tax)! According to CamelCamelCamel the price has never been below $189. **** The Aqara Hub +IS+ required. Be sure to get the one with Matter ****
For those asking about Matter support and Home Assistant. I purchased the Aqara hub because I wanted the Aqara lock… and with HA Core 2023.12.x (and newer) and Matter Server 5.x - HA was able to pick up the hub through Matter and the Smart Lock is recognized as a device and the entities passed are lock/unlock and battery status.