So here's the thing. ROCK AUCTION is a glorified set of multiplication flash cards. However, the game is played in such a way that students don't know they're practicing times tables. If Sesame Street hosted a poker tournament, it would look a lot like this.
The only additional materials you'll need for ROCK AUCTION are a bag of those little multicolored decorative stones that people much craftier than yours truly pour into vases and bowls and whatnot. The game involves using multiplication facts to "bid" for stones as they're presented individually by the teacher. The first student to obtain a complete collection (one rock in every color) wins.
Don't have rocks? Well, as teachers, our Spirit Animal is a spider because we're able to assemble something gorgeous out of material we pulled from our rears just moments before. So if you're in a pinch, multicolored LEGOs, Unifix cubes, paper clips, etc. would work just as well as rocks. Heck, even crayons would do. You'll find something that'll work, you clever thing, you.
Last tip: In my multi-age classroom, my students run the gamut from times tables experts to wee lil' beginners. I would recommend letting those who are just starting to master facts use a multiplication chart to assist them during game play until they have some experience under their belt.