I've been shooting bag targets, for field and target points, since I saw my first Morrell, about 20 yrs. ago. The only thing that wears out is the cover and thats a cheap fix (free if you have access to burlap bags or something similar). I got new ones, over the years, and now have two 3'x3' bags that will stop anything you want to shoot at them.
I've also tried about every "cheap" homemade target I heard about, for broadheads and, other that a big dirt pile (if your yard is large enough), haven't found anything that really lasts.