Warlord Games has their new Wespe self-propelled gun available over in their webshop for Bolt Action.
From the release:
Add more mobile long-range artillery support to your German army with the Wespe self-propelled gun perfect for taking on the Allies from 1943 the the end of the war in 1945.
The Sd. Kfz. 124 Wespe (German for “wasp”) mounted a 10.5cm field howitzer on a modified Panzer II (by now obsolete as a frontline tank) chassis. The superstructure was lightly armoured, with 10mm armour plate (enough to stop small arms fire) and was open at the top and to the rear.