Where can I buy canning jars?

Kerr jars work great! I know Cub Foods grocery store sells them. Otherwise if you don't mind shopping online, maybe try Amazon: http://www.amazon.com/Kerr-12PK-8OZ-Jelly-Jar/dp/B0000BYEQH

Good Luck!

Menard's has them

Any large quality hardware store will have them. They usually come in three sizes; papa, mama and baby and are in bulk - shrink-wrapped. 12 of the small ones (pint?), I know.

The Village Kitchen has a variety of great canning jars, at pretty good prices: http://www.villagekitchen.com/

Depending on what size and quantity you want, sometimes the hardware store is cheaper - but if you're buying a lot, Village Kitchen is often the best deal I've found...

Smart & Final