Using creative thinking... we come up with this:
My girlfriend using her passport account bought a gift certificate $500 @ 800.com
I used the gift certificate to buy a m505 @ 800.com price $399.92
I also bought a gift certificate $125 @ 800.com with the remaining balance
Total spent: $525
Received: m505 ($399.92 value), $200 MSN reward (Mine and my girlfriend's), $175 worth of gift certificates ($125 and $50 when you purchase over $299), and a free 16mb SD expansion card (MIR)
525-200-175=$150
My girlfriend using her passport account bought a gift certificate $500 @ 800.com
I used the gift certificate to buy a m505 @ 800.com price $399.92
I also bought a gift certificate $125 @ 800.com with the remaining balance
Total spent: $525
Received: m505 ($399.92 value), $200 MSN reward (Mine and my girlfriend's), $175 worth of gift certificates ($125 and $50 when you purchase over $299), and a free 16mb SD expansion card (MIR)
525-200-175=$150