I know BD probably carries a negative connotation, considering it's so much cheaper than LBS bikes, but I'm a student, and I don't have money growing out of my ass.

Recently, I purchased a 2013 windsor knight. it's going to come with a 44 cm handlebar, but my preference is 42. Would it be appropriate to consult my LBS to switch out this handlebar for another one at a small transaction fee? Or should I just purchase one from online, and leave the 44 cm laying around collecting dust?