Suspension

squeaking is typical on pretty much all older suspensions. Mine does that too and I just learned to get over it, it's not that big of a bother to me.

if you wanted to fix it, I don't know what you would need to replace, it could be springs it could be certain joints/bushings and such. It could be a lot of things being that the suspension is pretty much entirely made of moving parts.

Not sure on that price either, if you can do it in your garage or whatever it'd only be cost for parts and that's the nice way to do it. If you can't just go to some shops around your area and get some prices from them and go with the cheapest.