I said the old wheel weighs balanced a new tire of a different brand? I asked them to re-spin the tire and they said no need as it spun zero (perfect balance the first time). Ok....
Last change about a year ago I was charged $94 for my Grandvista and I brought the wheels and tires in!
I've gotten into the practice of balancing rims before installing tires. I've found quality tires are currently made so well that balancing is seldom needed. I check them, but it's not very often that I need to add even a 1/4 oz. Michelin, Bridgestone, and Metzelers are often spot on, tire after tire.
$94 for mounting? Yikes!!! I understand prices like that if they're having a tough time getting the beads to seat, which is often the case with scooter size tires. If they end up using a couple guys for an hour of sweating and swearing, $94 is a fair price for the labor involved. For cheap people like myself I just do it myself. For seating I've made a valve and a hose that I press onto the valve stem so I can flood the inside of tire with air to get the beads to at least get close to seating.