It's unlikely you need bead lockers. Two weeks ago, on another rock crawling adventure, we got into some pretty gnarly rocks, and I tore the sidewall down to the chord on TWO 35 inch BF Goodrich KM2 tires, and my son tore the sidewall on one 35 inch tire of a different brand. No beads broken.
Last year, I tore the sidewall of one tire on my CJ5, no bead broken. We run air pressure down to 5 psi, and have never lost a bead. We also spend a week in Moab every year and run a lot of difficult trails, and again, no lost beads.
If you are going to pin the throttle through a rocky mud field with low air pressure, than you might need bead lockers. If you are going to be gentle on the throttle (my philosophy: the slower you go the less you break) through the crappiest part of the trail, you will be fine.
You can also squeeze wider tires on a stock rim, a poor man bead locker, and you make it even more difficult to pop a bead. We have 14 jeeps in our family, ranging from 1947 to 2014, and we wheel a lot and wheel hard. Spend your money on a winch or something else that will provide a more useful purpose.