According to Wheaty Wheat, Space Crab and Buckeye are on the ocean steaming to a store near you. They should soon be available at finer vinyl toy retailers and via Wheaty Wheat's online shop.
Space Crab by Pixelfillu comes in 4 limited color variants: Green (limited to 160 pieces); Black (limited to 80 pieces); White (limited to 560 pieces); Red (limited to 304 pieces). Each figure comes with removable helmet, articulated eyes and claw arms.
Buckeye Rot by Sket-One has been a long time coming, but worth the wait. The figure comes in 2 limited color variants: Regular Red (limited to 804 pieces); Black w/ GID Teeth and Eyes (limited 204 pieces). Each piece comes in its own wooden crate with two sets of interchangeable hands and 2 knifes.