The "two for the price of one" or "buy one, get one free" quotes below are either directly or apparently attributed to President Clinton; perhaps he was playing off the media's promotion of Senator Clinton as a co-President. Nonetheless, here he is, using the same quote himself:
PBS transcript - then-Governor Clinton saying "buy one, get one free"
Brittanica, "Attempt at health care reform", then-Governor Clinton saying "two for the price of one"
A BBC article on the current (2008) campaign
WaPo's Charles Krauthammer on the current (2008) campaign
LA Times opinion, Rosa Brooks on the current (2008) campaign
Business Day online
President Clinton on doing for Hillary what "she did for me... talk to her about everything."
An AP news report examining then-First Lady Hillary Clinton's contributions on foreign policy during the Clinton-42 era.
On a lighter note, I think I know why SNL keeps shilling for Senator Clinton - Amy Poehler does a fine job as Senator Clinton, while Fred Armisen-in-blackface is awful. Apparently, there aren't any good truly-Black comedians who can imitate Senator Obama. Or maybe the good Black comedians realize the mediocrity that is SNL these days, and stay away!