Me!
My door key cylinder broke - it was just spinning away in there
I ordered a new one ($180 installed - tumblers cut). But here's the catch - it takes 5-10 days to get in from Germany
So, needing to lock my doors until the new cylinder gets in.... I had to buy a master key fob ($120). I got a used one (in somewhat beaten condition - but it works) so I can now lock/unlock my doors. Problem: Used Key chip wasn't working with the car's immobilizer....
So, now I have half a master key (just the fob - no actual key). The other half of the key was ordered (an extra $50)...
$180 for Key Cylinder
$170 for Master Key Fob (key blade cut, new chip, used fob everything programmed)
$22.75 tax
$372.75 Total
But, a new master key, cut and programmed from the stealership = ~$350 all by itself
Woo! At the very least, maintenance costs has been pretty good otherwise - nothing has really broken (despite a few things being broken).