Apparently, no one has them.

WB,
The crossandras are beautiful and I have a friend with one in a sheltered microclimate that survived 26 degrees this winter; however I recommend you consider the justicas as an alternate because they are reliably hardy in your zone - or at least touted as such. If the link doesn't work it's: http://davesgarden.com/guides/pf/go/643/

Here is a link that might be useful: Jacobinia