The company that put that one out has a metric TON of different "two-packs" out now. I went to Best Buy and it's like half the GBA section is devoted to these things. I would gladly buy a cart with all or half their lineup represented, but getting them two at a time is a little weak. The shame is that I really like the classic game packs on the GBA. Also, the Ultimate Brain/Puzzle Games packs are a much better value.
There are 11 of them, you can check the list out here
or my handy cut/paste job below.
Risk / BattleShip / Clue
Aggravation / Sorry / Scrabble Jr.
Trouble / Connect Four / Perfection
Gauntlet / Rampart
Klax / Marble Madness
PaperBoy / Rampage
Spy Hunter / Super Sprint
Board Games Classics
Millipede / Super Breakout / Lunar Lander
Asteroids / Pong / Yar's Revenge
Breakout / Centipede / Warlords