First, just how many of these decks are you selling? Let's say for sake of argument I want to buy a few gross from you...
Second of all, do you have them in your possession? While it's not a rule, it's not a bad idea to let people know these are "pre-orders" if you don't have them in your warm and sweaty little hands. Imagine the chaos and disappointment if something happens and your box ends up in a monks's retreat on top of a mountain in Timbuktu or something or in the basement of a flooded mail facility or some other unfavorable place, the end result of which being you don't get your decks? Let your buyers know you're still expecting your decks to arrive and if something bad happens along the way, they had some degree of "heads up" that such things could occur, especially if you started collecting their payments before they arrived.
This isn't some kind of personal attack, just so you know, nor am I accusing you of any kind of shady practices - I'm just offering you some words of advice and caution. Personally, I never sell what I don't have in my possession. Where I live, Murphy's Law is very strictly enforced...