I like this forum and I really don't want to start any arguments.
 
But plenty of workshops I know have racks with at least 40+ different size engine mounts that suit most cars, we used to get them supplied by Cool drive.
 
And a MR2 is the same as any FWD car, only difference its all in the back, if a mechanic can't properly quote a 20 year old car then I don't think they should be quoting at all, I have worked on brand new Camry's and Lexus's that are more complex than a MR2. 

No one was starting a argument, just stating my opinion as were you. 
 
Back on topic:- O P have you shopped around to get the work done yet or looked into getting the parts at a better price?
 
 

As mentioned by many it seems their labor charges are ridiculously high.
Take a week off work, get the parts outsourced and start researching how to do stuff yourself!
 
For example
'Rh Inner Steering Rack End Is Worn $220'
 
I ordered RH & LH rack ends with boots from autobarn last week for a total of $61 AU.
Got home and spent 50 mins under my MR2 and had it schmick including a wheel alignment after an hour and a half.
Labor is too expensive these days and if you want to own an MR2 your going to want to learn the car in, out and upside down.
 

send me the car and it will be a lot cheaper. fly down and drive back. i get lots of jobs like this. everything you need is in stock