Yes. Member andy_cyp purchased one, and I think others have too.
IIRC Andy paid relatively little - I suspect that MB put their prices up as demand rises, as that happened when the number of silver/chrome ML W163 grilles exploded a few years ago - the prices increased to reflect.
I've certainly purchased two "C55" lip spoilers for the C W203 that are the equivalent to the "E63" lip spoilers for the E W211. I forget what the list price was (painted) but I managed to buy them with a significant discount - and that was buying them separately, not a discount for buying two.
Your best bet is to phone around a few parts counters, and find one with a spoiler sat on the shelf for 12 months plus. You'd be surprised how many parts they get lumbered with due to cancelled orders and the like, and once they've sat on the shelf for a while the dealer is keen to release them in exchange for cash!! That's how I got the two C55 lip spoilers.