A few customer value marketing products I can recommend:

Insider Secrets to Customer Prepayments in QuickBooks
How to Record, Track, Refund, and Monitor Vendor Costs for Customer Prepayments in QuickBooks. 66 page pdf. Many full color screen shots. 100% money back guarantee.
Insider Secrets to Customer Prepayments in QuickBooks

Start Living Your Values Centered Life – Today!
Whose rules are you living by? If your life were a play – who would have written the script? You – or some one else? Living Your Values Centred Life e-book gives you back the control of the word processor to edit and rewrite the script of your life.
Start Living Your Values Centered Life – Today!