Quiwi said: You're still spending $25 every time, so $25 for $35 worth, almost a 30% savings in the long run.
Regardless, I actually specifically needed to buy an itunes gift card tomorrow. Might as well do this. Ty op. you can definitely do better than 30% (compound interest!!!), try this simple scheme: round 1 ($500 input):
$250 iTunes GC + $250 BB GC + $100 bonus round 2 ($250 BB GC + $100 bonus):
$175 iTunes GC + $175 BB GC + $70 bonus round 3 ($175 BB GC + $70 bouns + $5 new money):
$125 iTunes GC + $125 BB GC + $50 bonus round 4 ($125 BB GC + $50 bonus + $25 new money):
$100 iTunes GC + $100 BB GC + $40 bonus round 5 ($100 BB GC + $40 bonus + $10 new money):
$75 iTunes GC + $75 BB GC + $30 bonus round 6 ($75 BB GC + $25 bonus, save $5 GC):
$50 iTunes GC + $50 BB GC + $20 bonus round 7 ($50 BB GC, save $20 GC):
$25 iTunes GC + $25 BB GC + $10 bonus round 8 ($25 BB GC + $10 bouns + $15 from saved GC):
$25 iTunes GC + $25 BB GC + $10 bonus round 9 ($25 BB GC + $10 bouns + $10 from saved GC + $5 new money):
$25 iTunes GC + $25 BB GC + $10 bonus
total spending: $500 + $5 + $25 + $10 +$5 = $545
and you will have
$850 iTunes GC + $25 BB GC + $10 GC
but i am sure there are ways to do better than that 
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