How can you stop business you have credit from that are pulling credit checks on you every month?

You have few options to stop this practice. Businesses with whom you have a current account have a "permissable purpose" as defined by the Fair Credit Reporting Act to access your credit report. This is, in fact, standard operating procedure in the financial world. I suppose if you closed the account and revoked all their rights (by some means), you could, in theory, stop them.