They're a company that puts out boutique releases in Korea. There are quite a few of these companies, putting out steelbooks, "fullslips", "plain editions", etc, Nova are one of the bigger ones.
Shipping costs depends on what you're buying. For this order, it was $35.85 for k-packet shipping (IIRC, EMS and maybe Fedex were also (more expensive) options). I limited my order to these three (even though there are plenty more I would've liked to grab) because adding anything more shot the shipping cost up by a lot.
Packing is extremely good, as anyone who's ordered stuff like this from Korea will likely be familiar with. Thick cardboard shipping box with an ungodly amount of bubble wrap. I'm talking each set wrapped individually, then stacked together and wrapped together in more bubble wrap, and then wrapped again in even more bubble wrap. The end result is often the thing shipped in a box that's twice as big as needed, and all the empty space is bubble wrap.
Order was placed on the 14th, shipped on the 20th. This is an outlier, likely because of a busy sale period. Previous orders I've done with them (granted, quite a few years ago) shipped out within a day.
Both the boxsets state all region on them, though Nova's site says A for the A Better Tomorrow set. Region codes aren't a concern for me, but I'd double check stuff to be sure before ordering anything. In my limited experience though, similar to Japanese BDs, Korean stuff is often region-free.