Crayons and I have been playing this game (for two players) from Low-Cost, No-Cost Teaching Aids by Mary Ann Dasgupta. She calls it "Tables Dice." You could also play it to teach addition, but we're using it for times tables.
We use four dice, but you could play it with two. You shake two dice, then the other two (or shake two, remember the sum and shake them again). Multiply the sum of the first two dice by the sum of the second two. So you roll a 3 and a 4 with the first two dice, then a 5 and a 6 with the second two; you multiply 7 x 11 and get 77. The other person does the same thing. Whoever gets the greater product gets one point. Ten points wins the game.
Simple, frugal, and very good practice.