re: What's the going rate for garage door spring replacement?

Seems about right. I've always replaced mine myself, but mine are the old style extension springs, not the torsion ones. My neighbor works for a construction company, and is a big old baw and he helped me out the last time I had one about to break. I've got two single garage doors, and since I've been here I've replaced all 4 springs. It is not hard to do if you're strong enough to stretch it and have an extra set of hands to attach it once stretched. I also have the steel cables ran through, so when they inevitably snap, they don't go flying through the air. Just the springs are anywhere from $35-75 depending on the type, so $200 to replace isn't that bad.