From the release:
All the King's Men is pleased to announce that we now carry new trees – veritable forests in a bag. These trees come as deciduous and coniferous. The deciduous stand 5-7 inches tall, while the coniferous are 6-10 inches tall. They're ideal for any scale from 28mm to 54mm. We use them for 54s, of course (as shown in the pics).
You get 12 trees in each set for $32 USD + shipping. You can see (and order) them on our Terrain page.
Each tree comes with its own plastic base, but they're ideally mounted on larger bases for extra stability.