http://reedmariculture.com/
I have ordered from these guys a few times with zero problems.
they have awesome customer service.
a couple of times the shipment was a day late and they resent the whole shipment no charge to me at all.
they also ship with all the necessary documents to get it across the border including the fish and wildlife documentation.
as for buying it from somewhere else, no sure how the border guys would react.
probably shouldn't be a problem..but is it worth the chance?
hope this helps
Neal