If you haven't already I would suggest you try elusive disc at www.elusivedisc.com.
Sheffield and DCC are out of business, so you will most likely buy used. Chesky Cd's are found all over at many stores as those listed above. I personally like the Sheffield Labs sound. I have tried to sell a brand new Dcc cd for a while, and the cd's I did sell went for average price or lower. The market looks soft to me so don't over pay.