My favorite place to get cards is Target. There isn't a hobby store near where I live, so Target is fine with me.
Topps Opening Day pack, 6 cards (plus gum
Carlos Delgado #35
Carlos Beltran #47
Carlos Lee #89
Chien-Ming Wang #45
C.C. Sabathia #23And the Big One
Dontrelle Willis Diamond Star
Opening Day cards are my favorite, not only because they're cheap but they have the Opening Day logo and are a different color than the Series 1/2 cards.