Here's a screenshot of the company making them now. www.ltguns.com
from Argentina. Nothing on the website though but their Facebook says to mail them. From what I can make out they're $30 plus international shipping but don't take that as gospel! They do say mail them for info
I do know of some development in the UK for some but I'm not involved so won't go further into it now in case I say something I shouldn't!
Hope that helps though