Is there another cat laxative product that works as well as Lax'aire?

Pfizer makes a cat laxative (to help with hairballs) called Lax'aire. My cats love it and so far I haven't found another that they like the taste of. I have been trying to get more Lax'aire for a couple of months now but everywhere is sold out and they say it is on back order. Does anyone know of another cat lax product that cats like the taste of??