Wow, the part is expensive (even retail it's around $200), but they socked you for the labor. I could change that out in our parking lot in about 1 minute. That includes opening the hood and taking the engine cover off. I would go back and complain about the labor charge, as that is REDICULOUS.
Here is a link to our tips and maintenance subforum with a picture of where the MAF is located.
http://www.automotiveforums.com/vbul...d.php?t=746374
As you can see, it's 2 screws and a wiring harness plug to change it out once you get the engine cover off (which consists of unscrewing the oil fill cap adaptor and removing it).