As you've pointed out, pricing is so subjective to region.

$200 for that whole project seems low regardless however.

The better thing to do would be to estimate how much time it will take, then determine how much it is worth to you to spend that time on it.

Guaranteed it will take much longer than you think though. Even to make a small change will take 10 hours or so, with testing (which you want to do as much of as possible), determining the fix, and actually doing it.