Attitude is a pretty darn good place to do business with but I tend to doubt that even they will say its cool and the gang, just send them back because you made a pricing error and we’ll refund your bucks.
 
Maybe they will but I tend to think that you impregnated yourself by not making sure of the cost in U.S. dollars before making your purchase.
 
Possibly the best option would be to find a friend who grows or is willing to give it a go and sell them to your friend. Maybe you will have to sell them a bit cheaper than what you paid for them but when you consider return shipping fees and if Attitude does take returns and has a restocking fee you would likely lose as much that way. Plus if they did not make it back to them you would still owe then the full amount and have nothing at all for your money.