I have a Morrel Yellow jacket bag target and a McKinzie block broadhead target. I got them both at my local Rural King farm store and got both for less than 100$ total. Both will take a long time to wear out and I'll get my use out of them.
I have made several of my own out of different materials, with the longest being a woven poly grain/feed sack, like a grass sack out of poly and cut old clothing up into strips about 2" wide, no zippers or buttons. like jeans, upolstry, curtians and such. got a huge bag at a church rummage sale for rags @ 1$ a bag. I cut them up and filled the bag as tight as I could and then tied off top. Instant bag target for feild points that lasted several years! I had a 5$ bag target. I have used compressed cardboard too with good results, I guess it all depends on how cheap/creative you wanna be! Good luck.