Abbysmum said "Try the places that sell hard ice cream - Twisters, Velvet Dip, Forbidden Flavours. They might sell you a pail.
If you only want physical pails (without ice cream inside), I've bought them from Kuipers. I think it's $2 for a pail and lid, usually they're about 3 gallons. "
Thank you, I wasn’t sure where to start looking. Good idea! I will check to see if these places sell gallon pails.