I'm in the UK and have a '18 model SS. I knocked the passenger door mirror the other day, broke the glass and cracked the housing.
It's repairable but I called the only Chevy dealer in the UK for replacements.
Glass only: approx $365
Mirror housing (inc. glass): approx $ 1300 (not painted)
I can't import a US one as the EU mirrors are different, but still! Are US prices for what I would call easy to damage items so much?