Reebok premier jerseys

So basically I ordered a Clay Matthews XL premier jersey a while back, and am still waiting for it to ship. My question is, does Reebok make jerseys in small quantities and in waves or something? If I look for that exact jersey at Modell's, Dick's, NFLShop, etc., they are currently all slated to "leave warehouse" in 3 weeks and they only offer XXL. If so, is 3 weeks accurate, or is it faster/slower? I only ask because I find it odd that it is the same across a number of sites, and also I live abroad so I have to account for someone bringing it over from America, and I fear the season will be over by the time I get it

It's always hard for Reebok to gauge what players jerseys are going to be in demand at the start of the season. Look at Jamarcus Russell for example, #1 pick, franchise quarterback, huge bust. Players like Matthews either make a huge impact or get injured and fade away. At the start of the season they have the favourites sorted out, Matt Ryan, Favre etc and then have blanks waiting for the breakout players. I would imagine that the small number of Matthews jerseys they had at the start of the season have all gone and the retailers have to order and wait for them to be made, so three weeks is about right.