Is there a chance I could exchange this?

Ok so i bought a snowboard about 2 months ago( :P) at a skate/snow shop that i go to alot and i know the owner and he knows my parents and stuff but we don't interact much as friends(he is in his 30s and im 15). He convinced me to buy this snowboard(well he convinced my dad and he asked me if he should buy this one and idk why but i said yes at the moment). I bought the Burton custom 2011 which is more of an all around board but mostly for mountain free riding. i now regret buying that one and want the Rome Agent 2011 which is alot like it but is more friendly towards rails/ jibbing which is what i want to do 90% of the time. i was wondering if anyone thought i had a chance of exchanging the boards. they cost like 20$ different. on is 500 and the other 520 and i got 50% discount and no tax! which will make the chances of exchanging it even less. oh, and the normal return policy is 7 days for full refund, 14 days to exchange for another product D: i am really desperate please help me