This is the first phone that shows up when you go to MetroPCS.
https://www.t-mobile.com/cell-phone/lg-aristo-4-plus
And it uses Micro USB.
https://www.amazon.com/Aristo-Compatible-Charger-Transfer-Mi...
If you care to go down the list of all the cheap Android phones that are sold, you will see a lot of phones that use micro USB.
As far as super cheap - that basically defines most Android phones being sold.