The last way is the $35 rings and bases. Your results are a crap shoot. It might be perfect, or it might kink your tube. Good luck. One thing you will know is it will not hold torque and will come loose when you want it to work, even with loctite. Also, dropping or banging your rifle slightly will result in the need to resight in.
maybe im just lucky but i have never spent more than 10$- 40$ on a set of rings and bases on any of my guns and i have never had a problem. ive banged and dropped a few over the years. i know you get what you pay. lapping and bedding ive never done.