I used a Amazon Basic 2.1A USB Power supply on my SDRx / CHIP Setup and it worked well for over 250 Days without a single shutdown. I used a cheap short (30cm) and thin usb cable.
My Dreamcatcher v2.03 with active Antenna is running on a 2.1A USB power supply from a Cheap Tablet from China that i got over 3 Years ago. The cable is also from the same tablet and it now runs for some weeks without problems.
I also measured my DC 2 (DC3 should use a similar amount) and it never used more then 1A at ~5.15v.
Wifi AP was on and connected to my PC, Packets where also decoded from Alphasat
I don’t think that they should sell extra USB power bricks and cables, when anyone can get them locally very easy and cheap