Welcome to the checkout cheatsheet. Next time you're at the Arcadia Apparel checkout screen use one of these to get a sweet discount.
You do not need to enter the quotations :)
At the checkout, use:
1) "yay10" to save 10% on the total purchase (while supplies last)
2) "ooo15" to save 15% on the total purchase (while supplies last)
3) "ahh20" to get 20% off the total purchase of $100 and up (while supplies last)
...for even greater savings you COULD try story mode. Just sayin'...