The plastic on the handle will crack eventually, but wrap it with some black electrical tape to give it new life. Works for me.Buckets with gamma lids would be your cheapest option. The lids are great because they will keep out bugs/rodents as well as humidity. The downside is that the bucket handles are not well designed to carry that much weight. The metal loop is fine but the plastic will eventually break.
I'd look around craigslist or local fb groups for used vittles vaults as well.