Miss Kitty's right. Red Bar serves them on the weekend, 331 on weekdays. I think one of these two places is the easy choice for crab cakes. Very reasonably priced, and you actually get LUMP crabmeat, not that mushy, deviled-crab typ crap most others use. Plus, I don't know of anywhere other than the aforementioned places where you can get them as an entree.
Don't know where Oli buys his crabmeat, but he must get a great bargain. You get two crabcakes, plus salad and a side for less than you would pay for one appetizer-sized crabcake at most other places.