I made up a set to use with travel teams I coach. I went to a medical supply store and bough a box of sergical tubing (50’ was $20-$25). It comes in red, green and blue with each color having a different resistance. (I bought red - the lightest resistance - because I was working with young kids at the time.)
I then went to Home Depot and bought some carabiner clips (99 cents each). The clips can easily be attached to chain link fences/backstops.
I cut the tubing into pieces, tied a big loop and one end for a handle and a small loop at the other end for a clip. I also zip tied the ends of the knots just to make sure they didn’t come undone.
I was able to make four sets of three bands for under $50. I use sets of three so each station can have on band hooked to a fence/backstop down low, up high, and mid-torso.
Just another option.