From the Old Spaghetti Factory site:
"To celebrate our 40th anniversary, beginning March 31st, we invite you to come in on Tuesdays for lunch or dinner and receive 40% OFF on our Pasta Classics. "
Their special menu has a number of meals for around $5-6 and the childrens spaghetti meal is just $3.
The discount is good through May 26th.
I heard about this one from My Money Blog.