If you must drive your car, you're stuck with the dealer. If it is the MAF and you can wait, you can save alot of money by just buying the insert and installing yourself. I just did this and paid $147 for the insert. I've seen them on ebay for around $100. I also bought some security torx bits but I don't recall if I actually needed them.

glenmore
1990 LS400
1991 300CE
2000 C280