I have plenty of Permethrin, I wasn't sure if it worked on ants or not. I get mine off of Amazon. Not sure which is cheaper to be honest but when I price compare other things I often find TSC to be a little on the expensive side. Next time I get it I am buying it from the Garden Shop I sell plants to. I like the owner (he showed me how to work with plants so I could start a nursery that supplies him) and regardless of price I buy from him. He was also the guy who told me that Permethrin is derived from marigolds and that planting Marigolds around a Chicken Run may prevent mites. I have chickens on both sides of all my fences unless its a fence at the property line so Marigolds didn't really fit my situation.
The kind I have is working pretty good. I mix up a batch and then attack the ant hill's with it. I flood the holes they use in it too. It forces them out of the hole's but by the time they exit, it already got them anyway's.