M&M's, starburst, skittles, change, and beans
Any multicolor candy can be used for counting, patterns, addition, subtraction, multiplication, division, fractions, ...
change is good for counting, patterns, addition, subtraction, and learning about money
beans can be used for place value if you take the time to glue them to craft sticks to make a base 10 set.
We have a set of C-rods. DD doesn't get the concept of the white one being = 1 and the red one = 2.