For orders paid by check or debit card (ACH Deposit), we do not issue refund checks for any reason.  Any money owed (whether from a cancellation, over-payment, etc.) will be issued as a credit towards a future order.  If the orders were paid by credit card, a refund for over-payment/cancellation is possible.  We will not issue refunds or credits for differences in promotional pricing.  Please double check your math before submitting an order.