Good source for 10" Drums?

Need some more help, I can't find anyone who sells drums for 8 3/4 rear with 10", 1 7/8" brake shoes. All my local auto parts stores told me that they are not made anymore, I'm not sure if they can be turned anymore. The drums have been re-drilled for 5 x 4 1/2" B.C.

Are these available new from anyone?