I have several gamma seal lids that I use as current stock for ready access. But they are way too expensive..
I purchased good clean used food grade buckets for $1 each, but purchased new lids to get a good seal.
The bucket is just protecting the mylar bag from puncture.
The prices of product. If available. Has skyrocketed.
I try to use whole grain and beans with low moisture that can double as seeds if needed.
While I have a nitrogen tank to flush, I rarely use it. It’s good for porous items.