That's a good deal. I bought a Lenovo Thinkpad PSU from Amazon, a 240w and I bought a converter from their yellow plug to a USB-C, the problem is the converter only allows for 100w to go through it and the Nano would only do low, not medium or high.
I checked Red Panda's videos on YT and saw the power supply he was using, yeap they are still on Amazon but I found one better which I mining with using the 240w usb-c cable that he recommends.
My Nano is doing 4.13 RTHR/4.01 Ave-HR @ 44c (t) / 90c (h0) temps, using 125w of power using the amazon power supply that is similar looking to Red Panda's, it says its supposed to be a 140w PSU.