What's your favourite cheap LEDE/OpenWrt device?

[RadioOperator]

I know what you mean.
AX3000T RD23 problem, already solved:

OpenWrt support for Xiaomi AX3000T

Xiaomi AX3000T RD23 (Global version): OpenWrt installation guide for installing OpenWrt on the Xiaomi AX3000T RD23 (Global Version). installation method: UART flash. ** the following OpenWrt installation method requires opening the device, connecting a UART cable, and following a specific set of steps. This process is recommended only for advanced users, and may soft-brick your device. Please do not forget to make a backup of original router partitions before performing any actions …

and AX3000T cost us$24/set in CN, plus shipping cost, how much?

not expansive for 3sets or more.