Claims for invoices may be submitted as frequently as desired. Where the amount involved is too large to be paid from revolving funds, invoices allowing discounts shall be submitted on special schedules, with a notation to the State Controller requesting an expeditious audit and issuance of the warrant. Invoices for amounts of $50 or less exclusive of sales tax, and invoices payable by authorized bank drafts in the amount of $10,000 or less inclusive of sales tax, are conclusively deemed to permit immediate payments from revolving funds when such funds are available, and such invoices shall be submitted when reimbursement of the revolving fund is claimed. Letters of transmittal covering claims are not required.