I love using Sight Word Mats! They are a great work station for kindergarten. I can easily change out the manipulatives and the students get practice with the sight words they need in a tactile way. They are also an easy to differentiate work station!
I like using small Sterilite containers with snap lids to store manipulatives. They are easy to store and stack!
Some other popular ideas are:
gems
play doh
wikki stix
unifix cubes
noodles