Have you gone to a store that just does tiles? They will have the most options for you.

Is this for a shower floor or wall application?

Daltile/American Olean make 1" hex porcelain tile in many colors. I don't know its thickness, but it is high quality tile that they have been making for many years.

Thank you everyone. This is a backsplash in my kitchen.

I second the Daltile suggestion. They make 1" penny rounds, as well.