I received a brochure from a company in Hanford, California advertising “factory wholesale water tank pricing” directly available to consumers.
They sell water tanks, underground cisterns, portable pickup tanks, pumps & pressure systems, as well as other accessories.
I have not heard of this company, and I have no direct information on how they do business, but it could be worth looking into. The brochure indicates they’ve been in business since 1975.
WaterTanks.com
1-800-655-9100
Please send me feedback if you decide to contact them!