Best Store for Weight Loss Supplements/Health Supplements?

Starting Wegovy this Monday and I'm going to go all in with healthy living. I'm buying protein shakes from Costco to have for breakfast instead of bacon eggs and ham like I normally do. I'm also thinking about buying one of those powders that's concentrated greens. Does anyone know any good stores where I can buy everything I need? Also does anyone have experience with this sort of thing? Thank you!