It shouldn't...but it can and does if your U.S. vendor isn't prepared. Last year some of the places I shopped with a lot got hung up and ran out of stock due to bad or insufficient planning. It can happen. If in doubt...stock up!
EDIT: Oh yeah...and if there is a stock issue with a vendor, it's possible to be hung up clear until mid March or even later! So be forewarned! I'm not saying it's common...but it CAN happen!