About 17 years ago, I spent one week during the summer receiving Math Their Way training. At the time I was teaching first grade and I used the manipulatives and some of the activities, but not as much as I am now with my kindergarteners. We are lucky to have the Investigations Math Kit to use as a resource and that is what I use to plan my whole group lessons, but for my math centers I have updated the recording sheets.
I started using these centers last week:
Linking Cubes Center
Beans Center (they are plastic)
2-Sided Counters Center
Pattern Blocks Center
Counting Jars Center (color code the lids and place counters in them)
I have a few more I plan to switch out sometime in the next few weeks. The students have enjoyed playing these "games" and recording the "combinations." They are becoming more fluent everyday!