1. The online codes are good for one use only. Once it's used, it cannot be used again.
2. Using the printable barcode in-store can happen as many times as we print it out and bring it to the store. It has unlimited uses.
3. If you want 40% off your best bet is to print out the e-mail link that the earlier poster (aigochamaloh) posted in post 9 and take it to the store. (This is unconfirmed as of 1pm est 4/11) Make sure to rep her if you choose this. She's done us a kindness.