We have a leisure bay spa. Here recently we run jets 1 and it runs fine. Turn on jets 2 and the gfi trips. I unplugged jets 2 and ran only jets 1 and it does not trip. plug jets 2 in and BAM it trips again. Any Ideas and how much does a new blower cost . Can't seem to find one for leisure bay spas.

Sounds like your pump motor is shot, not the blower. Just replace the motor with a similar unit.