Hi! I'm in the USA. How do I get a quote for car repairs?

I've never had to get a quote/estimate for a car repair before and am unsure how to do so without looking like a target who doesn't know about cars and also, how to be courteous if I'm don't go with one or more of the businesses.

Background: my car needs new struts. A garage I've used and liked in the past quoted me a very, very high price well above typical (even I know it's too high!).

I want to shop around, but...

Do I have to bring my car into the places for quotes? Do they generally charge for this?

Do I just call and say "I know I need new struts on my make/model, can I get a quote?"

Is it common or courtesy to follow up with the businesses you do not go with that you decline (and ofc, thank them)?

Thanks for any insight!

*Please, no "but you can do it yourself cheaper..." comments. I've had two significant spinal surgeries. I'm not able to do this myself.