Knightriderguy:
Well The Arduino Mega is one of the ones you get off of eBay...
https://www.ebay.com/itm/Arduino-Compatible-Atmega2560-16AU-CH340G-ATMEGA-2560-R3-Board-Mega2560-R3/400935362320?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649
The "official" boards use an FTDI chip, so the drivers would be from FTDI. This board, from what I can tell, uses the infamous CH340G from WCH (the smt chip near the usb port). As the chip maker's website is all in chinese, I can only attempt to get you to the right page... Here is the link.