My guess is that they are charging you about $150/hour. So I fugure:
$150 labor for oil change
$150 for an hours of "inspection time" as part of their "yearly maintenance" BS
$56 for oil ($7 x 8 quarts)
$42 oil filter and crush ring
$2 environmenatal fees
PLEASE tell me that you DON'T let them wash your car, too.