Client sells quilting long arm sewing machines and takes $500 deposits (usually via credit card). They invoice the deposit with a /dep misc code and process the CC payment. At the same time, they enter the order for the machine and enters a /dep line to reflect the deposit. If they take additional deposits before shipping, they invoice the deposit and add a line to the order to reduce the balance due. Works for them. Also, because the process and invoice for the deposit, they can also issue a credit memo against the original invoice to refund the deposit via CC if customer cancels the order. They do have to stay on their toes and keep an eye on the deposit account.