You're going to spend more than $50 on crash repairs while you learn, probably double or triple that if you add in the value of your time. I truly understand not wanting to pay money for club fees and AMA membership when you could buy another plane, but what your money gets you in a club is knowledge. That Super Cub will come and go as your skills progress, but the knowledge that the club gives you will let you advance in the hobby to wherever you want to go.

So, sales pitch all done with, you've crashed your plane twice now because you haven't learned how to land. I'm not going to give you a hard time about that, although working with an instructor would have prevented it. Instead, I'm going to tell you how to learn landings.
1. Do taxi practice on the ground, focusing on keeping the plane as straight as possible. That will sharpen your rudder corrections and teach you to stay in control no matter what the plane is doing.
2. See how fast you can taxi without taking off. Do it in different wind conditions. That speed is your stall speed, which is also going to be just a touch slower than your landing speed.
3. Do little straight line hops, focusing on rising smoothly and settling back in smoothly. You'll have to work both the elevator and throttle to do this, which is the key to good landings. You'll also have to work the rudder to stay straight through it all, which is the key to not crashing. Don't get more than a foot off the ground when you do these. And do them in various wind conditions too.
4. When you can do hops on demand and each one is settling in with a nice flare, then it's time to do a real takeoff and landing. The approach (on a foamy Cub anyway) is just cutting power to the motor and letting it glide in. Be ready to raise the throttle and level off if you come in too hot. Actually, try to come in too hot on the first try and then lower your approach until you get it right. Once you are 2 feet or so off the ground, it's exactly the same as what you did with the hops.