There are plenty of mirrors available. What do you want to attach it to? If you want a wider field of vision are you thinking a convex mirror?
There is this from Overton's for $34.99: Ski-Image X 1000 Mirror - Overtons
https://www.overtons.com/modperl/pro...4aAvebEALw_wcB
Or a different style from WalMart and you could pick up some noodles while you were there:
https://www.walmart.com/ip/CIPA-Pont...&wl13=&veh=sem