Can someone suggest an 8x10 C-41 process color film, that is available for purchase? If not 8x10, maybe someone knows of a 4x5 available.

I am taking a Color Photography class at the UofA, and they have all students shoot C-41. Since I only shoot 8x10, I would really like try it with color. If no 8x10 is available, I can shoot 4x5...but that is the smallest I can go.