Bay Fung Tong is currently running a discount on their crab dishes.
Their signature Bay Fung Tong crab is now $12, not $15. They also have four other styles of crab for $10 (ginger and scallion, boiled, with black beans, and salted, I believe?).
Lobster also appears to be on sale somewhat.
No idea how long this will last, as they tend to change signs/prices based on availability (as one would hope at a seafood restaurant!).