Is it worth buying frozen online?

So i'm new to snakes and was wondering if it's worth buying frozen pinkies in bulk (50-100) for one snake? Or will they just go bad and get freezer burn? The only place to buy frozen near me is Petsmart and that's around 10 to 12 dollars for 6 pinkies. But I dont want to buy a bunch of pinkies and have them go to waste or be too small of a feed by the end. My snake only weighs 12 grams so according to the munson plan she should only be eating 1 pinky every 4-5 days, however, the person who had her before fed her 2 pinkies once a week, not sure what plan to follow. Any thoughts? Thanks!