2012 Toyota Corolla, my service center is saying my car needs some kind of plastic discs for the alignment which jacks up the price of the alignment to over $400.00 because they said the have to cut these discs?

go to an independant front end alighnment guy (whose "on the bit with good reputation ) and get a second opinion

Ditto to the above. That sounds a bit............ odd.

too much $ for alignment get 2nd/3rd opininion as the caster/camber are basic things to repair and plastic washers ??

I know what they are talking about and don't do it. It's a fix like putting sawdust in a differential, will work for a week then fall apart--- they can't get it aligned because something is way off and they are shims. May as well use duct tape. You may have a bent tie-rod because those discs are used for toe-- not caster--- not camber