Last time I went to Home Depot (needed some other things), the guy in the lumber section told me Home Depot wouldn't do that at all. Something about they didn't want to be liable if it turned out you needed a different length than you told them to cut. :(
They don't cut anything generally less than like 2 feet because with the saws they, use small fragments can shoot up and hit people. There are other types of cuts they dont do for similar reasons