There aren't typically any retailers for these. The closest thing you'll find through a retailer is the Raimundo Romantica. It looks OK for a budget romantic instrument but I don't know that it's the most authentic thing I've seen out there and I can't vouch for the playability and sound as I haven't seen one in person.
Typically you'll be able to get these from the luthier directly. In Europe there is Jan Tulacek and Bernhard Kresse.
I've heard that Kresse's instruments are on the expensive side, and I've heard that Tulacek gives a more budget friendly price but he has a very long waiting list. Some very good pro players play instruments from both of these guys and you can find some nice sounds on Youtube and some recorded albums.
There's also Carlos Juan Busquiel in Spain whose guitar I've seen played by Cecilio Perera, who is a very good guitarist. It has some little quirks that take away from the perfect authenticity visually speaking (in my opinion) but looks and sounds like a good guitar anyway.
In the UK there is Gary Southwell, he may be a bit expensive but he does have a good reputation.
In North America, there is Scot Tremblay (whose guitars I play) and up and coming builder Miodrag Zerdoner in Canada, and Michael Thames and Jack Sanders in the US.
Sometimes if you are like a hawk on the online marketplace you can find used reproductions or even original period instruments available for sale, so you just have to learn where to keep an eye out and be diligent for a while.
There's also Justin White in Australia who had a pretty reasonable price last I checked. I've tried one of his terz guitars, and it was pretty good for what he charges.
BTW if you are interested in a Lacote style, you may also consider a Stauffer/Viennese style. It has a bit of a different sound quality that I rather like. To my ear it's a little more resonant and brilliant, but they both have their wonderful charm anyway.
The Viennese instruments also typically come with an adjustable neck, which is an amazingly convenient feature.
Hopefully this helps!