If the item(s) you want are excluded from the promo I will refund the money on the following conditions:
a) you've taken a reasonable amount of time to figure it out. Ideally know what you want before you buy the code. A couple of days is ok. Buying on the 6th and asking for a refund on the 15th is not.
b) I'm going to refund you the day after the sale ends to avoid getting scammed by someone taking the refund and then using the code anyways.