Why does the official Barcelona store on Nike's website not have the option to buy player shirts?

I just bought last season's away kit at a discount price ($70, originally $90), when I noticed this. Does anybody know why that is? You'd think such a big business like Nike would give you the option to do so, not to mention pick just about any size you want (which sometimes they don't, fortunately I got my size). I was kind of disappointed that I couldn't get an Iniesta shirt, so I settled for just a plain club shirt.