Since you're stuck in Primm (Stateline to those who've been around a while), just take advantage of the MB Roadside assistance tow, Get towed to Las Vegas and have the dealer install the starter. I believe if the repair is done at an MB dealership then the tow is free. I'd call the roadside assistance again and ask about that.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.