The 215681 / 85387 prices I saw aren't too bad, actually. I'm not aware of any AM sources for those filters, though Lil Red Barn indicates they sell them. Someone else may have more details.
And depending on how bad yours is (if you indeed have one), they'll clean up pretty well with some dish detergent and a good soak in hot water. If you have an ultra sonic cleaner, that's even better. But a word of caution: Depending on the degree of any flocking deterioration, a USC can destroy what's left if there's any chance of the filter being salvaged otherwise. Keep a close eye on it if it's questionable.
And depending on how bad yours is (if you indeed have one), they'll clean up pretty well with some dish detergent and a good soak in hot water. If you have an ultra sonic cleaner, that's even better. But a word of caution: Depending on the degree of any flocking deterioration, a USC can destroy what's left if there's any chance of the filter being salvaged otherwise. Keep a close eye on it if it's questionable.