How are Sam's bagged salads? What items you get from Sams for meal prep? Thanks

Hi,

I am trying to lose weight and trying to meal prep. I was thinking of buying couple of Member's Mark Southwest Salad Kit bags and rotisserie chicken and do meal prep with it.

Any other advice or tips for meal prepping?

Would buying like my own vegetables for salad will be cheaper than buying bagged salad?

Thanks