well, start with online comparison shopping (like www.tirerack.com
Do you have a $5000+ wheel balancer? $55.80 isn't that far out of line.
Do you have a $20,000 alignment rack and a $25,000 alignment machine? $49.99 for checking the alignment to verify the tires won't wear out premanturely seems like a fair price.
$15 for valvestems is a bit pricy. They are less than $1 each. However the $5000+ tire changer isn't free to the shop.
$8 for tire disposal is CHEAP. You could have saved the $8 and taken the old tires then tossed them out on the highway
The only thing she got screwed on is the Tax!!!!
Dont forget the building, wages, benifits, taxes, permits, utilities, insurance, and other cost's the company has to pay in order to provide you the service of having new tires installed on your car. If you can do it cheaper yourself and save a buck, then you should buy your own tire changer, balancer, lift, etc. etc. etc.