Right now I am working out of a free sample of FP-10 and have in reserve a free sample of Breakfree. I have a free sample of Brownells Friction Defense in my range bag. I have also used essentially free Mobil 1 drained out of the can after a truck oil change and the free refrigeration oil left over from AC repair. I still have some of the free Gunslick and RIG that the local dealer used to throw in with a gun purchase and a free bottle of Sportsman's Choice Reel and Gun Oil from a boat show.
All work quite well when applied regularly; I don't credit claims of lubricants in "the pores of the metal." You may notice one thing they all have in common, they were free.
I also use military surplus PL-S, Lubricating Oil, Preservative bought cheap at a gun show. Some of it thickened with Lucas Oil Stabilizer obtained free by draining down the bottle after an oil change.
The last thing I paid much for was during the Militec-1 fad. I still have some of that and have been thinking about blending it with PL-S, being that it was originally a gear oil additive before they discovered the lucrative gun oil market.