I was traveling near LA today and stopped into a few of marble and tile stores to see if they had any black marble. At the last one I met Murray Weiner at Rio Marble & Tile just as the store was closing who told me he could and would get China black for me at $5.50 for a 12"x12". That price applies to any quantity from 1 to 359. 360 lowers the price to $4.95/tile. I will order some and report my findings. We did not discuss shipping. The store has branches in North Hollywood, CA and Las Vegas, NV.
Murray's email: riomt@yahoo.com.
Rio's phone in North Hollywood: (818) 9821500.