BPI-R4 power supply

According to Banana Pi BPI-R4 - Banana Pi Wiki, R4 needs a 12V/5.2A power supply. Where can I buy one?

BPI R2/R3 uses 12V/2A: https://www.aliexpress.com/item/32824593184.html

Most od the power consumption will eat wifi 7 module and nvme, 5amps should be good imho .

In extreme cases, the maximum power consumption of a single motherboard will not exceed 12W, so a 12V/2A power adapter is enough.

Then depending on the peripherals, you need to increase the corresponding power. For example, if you add a 5W 5G module or two 3W SFP modules, your power adapter will need to be increased to more than 24W.