Does anyone know where I can get a cheap version of this?

It's called a Cozy Bump and it's supposed to make it so you can lay on your stomach during pregnancy. I'm 7 months and can't sleep on my back because my legs always go numb. Obviously I can't sleep on my stomach and I am extremely uncomfortable sleeping on either side because my ribs are killing me. I'm constantly tossing and turning and I just want to sleep on my stomach but this Cozy Bump is way too expensive. Anyone know where I can get an off-brand one or a cheaper version?