$70 is for the foam and cage assembly. Basically it's the whole filter head.
Did some more research on it today. I called Monsterflow directly. Brian Goodwin is the sole distributor for their products and it sounds like Monsterflow is phasing out the whole thing. In other words, good luck finding replacement foam. You can use a recharge kit for any foam filter but replacement parts are non-existent.
Looks like I'll be doing the K&N from Gary.