I have about half a bucket that you can have. Definitely not live (tank taken down about two weeks ago) and you would need to rinse it really really well. I am in highlands ranch, just south of quebec and lincoln.
I have a 125 gallon the has a 4" deep layer of sand. It's free and first come first serve (you bring your own containers. It's still live and has some good critters in it, but could use a good rinse (worms, copepods, etc). Im located in westminster.