they are/were on sale on the cowboys pro-shop website. But they do not look as sharp the authentic practice jerseys that the team actually wears. IMO, they are a very cheap looking version of the practice jersey. the numbers are screen printed(poorly) instead of tackle twilled.
I have said this alot, I think they would sell like hotcakes if they were tackle twilled and if you could choose the number you would like to have on the jersey instead of only having 2 choices.
I'd buy one then.