Costco
Just got home from Costco. The least expensive veggie oil I saw was a "Golden Chef" brand soybean oil, $25.99 for a 35 pound jug. The fine print also gives the size as 589 fluid ounces, which is 4.60 gallons. That translates into $5.65 per gallon, so I didn't buy any, so I didn't learn whether sales tax is charged. If it is, the out-the-door price jumps to $6.10 per gallon. Either way, there's no point in buying it as a substitute for diesel fuel of any kind. Thus, all of the discussion of road taxes and engine damage is moot.

YMMV
Since this is almost certainly Midwest soybean oil, it had to be trucked or railroaded all the way to California. Forum members in other states may find lower prices. Let's hear from you.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970