Not double post though. Just a heads up for people only. One guy on Facebook for shipping fee to ship 14 decks to New jersey and I realized it's more expensive than buying from mana playing cards directly.
Yes, it was. You posted twice within 21 minutes of each other and no replies in-between. You could just as easily have edited the previous post to include the additional information.
"A heads up for people only"? Do you target posts to many non-people?
I see it's been pointed out to you previously. Multiple posting like that is frowned upon as a way to inflate post counts. It's a wonderful thing if you can broker a deal for cheaper Mana decks to "people", but do so a bit more concisely, please.
You might want to read the rules about forum etiquette. They're here:
http://aethercards.com/discourse/index.php?topic=76.0