I think you need to talk to someone in billing directly, but I know that they will accept checks by mail. Follow this link to contact billing and I'm sure they'll work out a way to take your money.
http://support.chess.com/Tickets/Submit/RenderForm
hi i live in tunisia , i want to get a premium membership , the prblem is i dont have an international card and even if i have one i cant use it becoz we only use the cards "valid only in tunisia" if someone can help me if he knows another way to pay chess.com for example paying them with cheque i want to know the procedure becoz i didnt use cheques in my life, thanks.