Hi Robin!  Thanks for your comment.  Love that Madrid wine!  Unfortunately there is no store that ships directly to the US due to US laws, but I assume Regajal must either have an importer already or be trying to get one.  If I find out, I will let you know.  
Casa Lucas is my absolute favorite since 2002 when it was totally unknown...that's awesome you liked it!  There are so many great places in Madrid and new great ones everyday, but Casa Lucas still stays right up on top! I've written about it several times and plan on doing an update soon.  
Cheers!