Look to Commercial food service suppliers. Only accept Food-grade products. All the comments in here are correct. The last thing you want to do is poison yourself and family by using long term food storage inappropriately.
If the resources in this link:
https://www.google.com/search?q=wholesale+food+service+outlets if that's too large an area to search, ask your local restaurants, delis, hospitals, clinics -- any commercial venue that serves food -- if they will share their suppliers with you.
Consider also making a relationship with local food service companies. Food handling and management is always managed on a state level, and I don't know about Maine at all, but you could ask them about food containers that they are ah, "retiring." They may still be good enough for your use. Please understand that most of what you'll be offered will be plastic, but you may be able to repurpose it in other ways than in food storage. Don't dismiss university level resources, especially if they offer any kind of chef/cooking/kitchen services offering. Call the admissions office. If they can't help you, thank them and call later. It's been my experience that the person answering the phone tells you what they know. Fair enough, but when you call back you'll probably speak with someone else -- who might know more.
I haven't done any research on it, but certainly the chemical or drug companies also use large food-safe containers. If there are some in your area, consider calling them for advice.
Other resources: Wineries, breweries, bakeries, creameries.
Good luck. I hope you find something that is the size and material you want!
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