The best learning for the little guys is to not think they are learning.
Giving them colored buckets with colored bears to sort with. Do they always get it matched up? Depends on their age but...it's fun. While doing it you can count them.
What about felt boards? We loved ours when ds#1 was that age. I just got a flyer today from a company to order CHEAP felt shapes. It's Library & Educational Services. I honestly don't remember how I requested the catalog but.... their website for ordering is
www.libraryanded.com and you probably can get a catalog ordered from there.
Ds#1 loved the magnet letters for spelling on the refrigerator & dishwasher.
Oh...the things that we couldn't come up with at this age that flow soooo easily now.
Sheila