It's always a good idea to plan your purchases ahead of time and break it up in multiple orders. First buy books with 100% rebates or those offering large rebates for CC only. Then use the Micropay to buy any that gives rebates when bought with MP. You can seperate these so the MP you earn for one purchase pays for the next e.g buy a $10 full rebate book on CC. Buy a $7 ($4 rebate) with MP and then buy another $7 book with last MP balance.
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