Gabe, C230 Coupe is a very cool car

Use the Buy Parts tab at the top of the pages at mercedesshop.com to get an idea on prices. Brake disc are about $110 for a pair of front and $100 for a pair of rear discs. Pads are about $70 / $50 f/r.

Where I am in Baltimore dealers charge around $500 per axle for discs and pads. I'm curious if a brake fluid replacement is included in that price?

check out tirerack.com ( they also have a list of recommended shops in areas around the country - though some shop recommended in my area I think are shoddy ) for the price of tires, $199 sounds high for a tire plus mounting and balancing, but in line with what many dealers charge.

$125 for a trans diagnostic it seems is fair to me, you probably need Mercedes Star diagnostic computer to do the work right.

Anytime you have A & B services where they check items chances are it's a very cursory look used to make easy money. Best to check you MB maintenance manual and see what items they recommend for change-out and have those items replaced.

chk forums like this one and benzworld.org and mbworld.org plus mbca.org
for their sections on recommended shop to get and idea of which places ti investigate.

I would have the tire taken care of, then wait till the dash display brake pad sensor light illuminates then have that done.

For the B service an oil change and cabin filter change are important to do at this time.

I'm curious why they say change all four tires and what the brake pad and disc thickness are. The upshift from first to second is a mystery, if you do a google search for STAR TECH MAGAZINE you can browse the archive and readif they discuss such an issue.