If you woud ever buy a rental car, you have obviously never ridden with me in a rental:cool:
No, you can buy calipers for not too much (probably around $40), and replacing them is not that hard either. I would always replace in left, right pairs. You just have to bleed the brakes more afterwards. Water collects in brake fluid except for the silicon based fluid, DOT 5, so it is best to replace the brake fluid when you do your brakes anyway. A simple inexpensive pump can help you do this easily. Just find a competent friend to help and it should be half an afternoon.
Brake calipers were oh-so-rusted
Shocks/struts were "leaking"
Obviously, they were trying to get me to say "duhh, OK, I need my car to keep running, so go ahead and replace all those things." But even back then, I knew better....took the car home, drove it for another few years and never had an issue with it other than regular maintenance.
Your car is old enough to where some of those parts you listed are going to look old and worn, but may not necessarily be on the verge of snapping.
And replacement of the brake parts is insanely easy. Do you have any friends who are mechanically inclined at all? You can save a ton of money just by tossing a few bucks to one of them to spend a couple of hours changing them out. Your driver's side window is likely not too difficult/expensive to fix either.