Those who have APS, where the heck do you find it? I've seen tons of things online saying people bought it at a Lowes or Home Depot type store, but most of those were from quite a few years ago. None of those stores in my area stock it with their pond supplies. Is there a viable alternative?
Yup.
http://www.terraforums.com/forums/showthread.php?134281-Good-deal-on-Turface