Nope. None available anytime soon according to Laurel Mountain Mustang (just stopped in there a few weeks ago looking for one myself). Everybody keeps saying, "Just a few more months."...been saying that for a few years now.
Dallas Mustang used to own exclusive rights to reproduce them, but their repros were notorious for being complete pieces of crap. They sold the rights to Scott Drake a couple of years back and Drake has been working hard to correct all of the faults and still keep the retail price reasonable. I'd heard this goal was eluding them.
Whatever the outcome of Drake's work on building a better Rally Pack, you can bet the replacements won't be built in the USA.