Thanks to all for the comments and suggestions... Found it in boulder, at A&B Fruiteria and Carneceria. I had checked there a couple months ago and found none, but they must've been sold out because yesterday there were at least 15 bottles.
Random question probably, especially considering this is what finally motivated me to finally sign up here after years of lurking, but does anyone know of a store in Denver or Boulder that sells this sauce?
For reference, I'm referring to the XXXtra hot Kutbil-ik sauce. I recently moved to Boulder from Maryland and my local grocery store there sold it for like $1.79/bottle. Every couple months I'd go in there and buy every bottle on the shelf. Moved out here in January and brought several bottles as an emergency reserve but I've run out and the withdrawal is pretty miserable. I've been known to go through a bottle in a couple days before, I have a problem.
I gather it's a whole lot cheaper to buy in person than anywhere I've found online so that is my first preference (also, I hate online shopping due to impatience). Any suggestions are greatly appreciated! Boulder is most preferable but I work in Littleton and thus would gladly venture into Denver on my way home to pick some up.