Lf affordable pure whey protein powder

Hey folks, any recommendations for pure whey protein powder on the cheap? Looking for unsweetened and unflavored ideally...I can add those easy enough. I'm flexible there, but absolutely no weird fake sugar substitute please!!!

Usually I use Amazon and get jarrow, but they're somewhat small containers, and after a few years I feel bad throwing the big plastic containers away...I've run out of uses for them. Hoping someone has found a more sustainable or at least affordable option, thanks folks!!!

Edit: Using this as a meal replacement for meat, but the goal is strength training, so soy is out too.