In addition to regular Bi-pods, you also have Bi-Pod Grips, a handy 2 in 1 version of a Bi-Pod and a Foregrip.
Battle Axe Tactical Bipod Grip - Desert
Battle Axe Tactical Bipod Grip
Ares Bipod Foregrip Black
Ares Bipod Foregrip Desert
Battle Axe T-Pod Grip Black