A friend of mine gets wheels from a Japanese e-bay site called ok-shon, and it pans out where the deal is good enough to pay for his shipping expenses.
I checked just out of curiousity once and found it prohibitively expensive to ship anything of any size, but somehow stuff gets here from China. I can't figure out how those ramen noodles get here, shipped from China and go on sale for 10 cents a piece.