Yes, you have 30 days to return the one you bought today. Keep it so you have it in case it sells out. If it's available on the 12th, reorder for the discount and return the original. That is a nice chuck of $ to put towards a 2nd item
But you loved it enough to pay full price so be ok with it if you can't get the discount.
I think 300 is a lot though - right? I never know. During the last F&F and SAS I was nervous about double swagger selling out because there were only 150 made, but my SA said that was plenty. I never know how to gauge supply vs. demand.