Not sure if this is in the right forum...

We have a larger dog that is becoming less responsive to verbal commands.

I am going to purchase a shock collar and each brand seems to have some bad reviews. Anybody on here tried one before? Battery life seems to be the common problem.

I would like to spend less than $200 -- more like $150 would be good.

Any suggestions?

Tri Tronic Brand, Sport Dog 105S and Petsafe yard and park are what I have looked at so far.
There are some re-build tri-tronics on e-bay with warranty.