Where can I buy a 100A fuse main fuse for my 1998 ford escort sport?

My car wasn't starting, no lights, no music etc was coming on. So I got a new battery, my boyfriend put in the battery wrong and blew the 100a fuse in my car. I've called ford dealer, Mazda dealer, autozone, pep boys, sunauto, fire stone, o rallies and can't find anything… Need to know where I can find the part? How much? And what it looks like?

Hi so the numbtie of a boy friend has done damage which only a ford dealer could fix so they would need to diagnose the problem and it would cost you to have this done.