I'm looking for the dreaded W203 power seat module. I want a new one (assuming they have corrected the design) so I don't want to mess with Ebay.

i like www.parts.com

you can try PM'ing this guy

https://mbworld.org/forums/exterior-parts/241844-mbworld-oem-new-parts-connection.html

I PM'd him for prices the other day as I am looking to do the full SL55 intake. Prices are actually lower at www.parts.com by 15-25% depending on the part

RBrenton is a moderator. He gets parts at wholesale. You won't beat that.

needs to shop more.
parts.com charges almost 500 bucks more for a bosch alternator than autohausaz.com 25% more for evap temp sensors,across the board higher prices.You could go broke shopping there
Try www.autohausaz.com if not listed they will quote non stocked parts.
RBrenton as mentioned
and Duval motors in Fl. the parts dept discounts all MB dealer and MB only parts very nicely.
$700 for an alternator,parts.com has got to be kidding.

There is a $10 fix for the seat module - involving adding a relay (connected to the cig lighter power) to the seat's power source, so that it shuts off when the car is off. It is somewhere on this forum, I just dont have the link at the moment, but you can always search. I will be doing this fix on my seats this winter.

If you still want to go stock, PM me, I have tha name and number of a buddy who works for an MB dealer in northern Illinois and can probably get it at cost.