Free: Contests & Raffles.
I may or may not get flamed for this but here we go. There is no chance in heck I would ever carry those rounds in a pistol I would need to use in a self defense situation. The anit gunners and the jury would see you as a "hole saw" killing extremist. They are absurdly expensive and really just a gimmick. No thanks.
Well to those that feel it is necessary to load with only non descript factory loads so be it but I'd rather be judged by 12 than carried by 6