Everyone else pretty much covered it. The availability of things like jerseys and various "authentic" apparel has been next to none. For example, I'd pay nicely for one of the soccer scarves and the heavy winter coat the team wears. I think others would as well. For example, look at the Portland Timbers team store, you can buy pretty much anything and everything the team wears. Now I realize that he Timbers are a professional organization, but I think taking orders like the basketball team is doing is a great idea. Ensures they'll order only as many as they need, and if there's still demand after that, do it again.
All that said, kudos to the basketball team for making these available. I hope the other teams follow the lead.