sawyer minis are $17.25 regularly from amazon lol

http://www.amazon.com/Sawyer-Products-SP126-Filtration-System/dp/B00FBGCFZG/ref=sr_1_13?ie=UTF8&qid=1431311616&sr=8-13&keywords=water+filter

amazon lightning deals do have some good survival/prepping gear for cheap at times however.