In my area Ace seems to be about the only one that stocks it but that is sure to vary. So look for ammonai and read the label to see if they note added items. Another way is to test it by shaking. The "surficant" we speak of as not wanted is somewhat like a detergent and will make the ammonia foam when we shake it. Shake and foam, we need to look further!
But before going to the trouble, have you gone through the thinking on how speeding up the cycle process might be done by getting hands on some used media? If you can get some used media, you can cut the time way down.