to get the 25x you need to turn your cookies off and then you can refresh the pages to try again...
The 25X Airmiles is worth approximately $3.36 for every 20 you spend (cause you get 24 bonus airmiles for every $20)
there is a minimum $60 spend, and is not valid on gift cards so for those of you buying those $10 itunes cards with the email direct coupon make sure you spend at least $70