Here is Logjam's Prolog. The Prolog is their top of the range unit that features an integral "groove board", and an ultra low stomping angle. The acoustic chamber is formed in the base as well as in the "head" allowing for a stomping height of no more than 2 cm. The design allows for the capsule to be angled up to the contact point and the integral board means that the unit is securely anchored by the players heel.
Don't let this deal pass you by!