Zaffer

Where is a good place to buy a hood ornament other than the dealer? Mine was missing when I bought the car and I’d like to replace it. Should I just look for a used one off of eBay? Really don’t want to spend $70 on a new one from the dealer. Any other places to check out?

Heguli

Well, you kind od answered your own question. If the dealer is not an option, the it's ebay. But, if the dealer has one for $70, is it that expensive, though? Here's OE one from ebay: https://www.ebay.co.uk/itm/123968846218

Looked up couple local parts dealers, and even though they sell the emblem bit cheaper, added postage brings the price to $65ish.

Sandygear

Cheapest would be the pick n pull or people with parts cars on their mercedes on Facebook marketplace.