HAHA This is not the first time for this, as I came across something very similar.

I needed a cabin filter and wanted to replace it when I changed the oil so I was going to buy one locally. I knew the part should be between roughly $20-$40 depending on if it is carbon or OEM. Chrysler quoted me $118 and Mercedes quoted me $104... Autozone (where I purchased) was roughly $30. And they wonder why no one goes to the stealership.... Damn.