4Ground has a diverse range of pre-painted scenery items that they produce in 10mm, 15mm, 20mm, and 28mm.
Turns out that voice actor Matt Mercer went and created a Witch Hunter Class that you can use in your D&D games! The PDF file contains three variants of the class which you can get here for your D&D session!
Be sure to swing by Critical Role who teamed up with Geek & Sundry to make all of this possible.
They just released for the Middle East/North African Militia the Militia Commander - Bravo, Militia Squad Leader - Alfa, Militia Marksman - Alfa, Militia RPG Gunner - Alfa, and Militia MG Support.
Considering the flexibility of this product it is certainly a viable alternative for GM's that don't have the time or inclination to build their own terrain.