I'm known to love a good deal and am especially happy if it's food related! Hence, I spent quite a bit of time finding as many offers as possible for my birthday. This was in December so the majority of the offers should carry over to this year.
For my birthday, 100+ emails greeted me. Besides direct email lists for restaurants, I also used ibirthdayclub for smaller San Diego restaurants though it's a hassle signing up for individual restaurants. The majority were the "buy 1 get 1 free" type, but I did find a few winners in the process.
The Works (Mission Valley area) - a free 2-topping pizza through ibirthdayclub. This was the biggest surprise as I was expecting something small! I estimate 14" in diameter! We also ordered their breadsticks which came with yummy marinara.
Fogo de Chao (all locations) - $25 off your lunch or dinner. Considering lunch is already at $32, this is pretty slick.