The filters vary in price, but one will last a long time with a little precaution (like using coffee filters on the intake). My Hiker is on the low end, but the filters are easy enough to come by (Academy and REI both carry) and it has taken a great deal of abuse without too much heartache.
Another cheap solution I've seen is using plastic Gatorade bottles instead of Nalgene. The traditional style bottles are made of a thick plastic and are wide-mouthed enough to be easy to drink out of, and filter into. They hold up very well.
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