Shipping cost is almost $30 making it about $75.10/box = $3.13/quart.
There's a branch store in Madison, Wisconsin (72 miles from my home). I can find another reason to drive that way some day & save on the shipping costs. That would keep it under $1.90/quart. 24 quarts of Duramax oil for $45.46 + tax. 24 quarts of Super Tech would be $97.92 + tax.
This wouldn't apply to my situation, but it's good to know about this product -
DuraMAX® 10-Year/up to 300,000 Miles Lubrication Limited Warranty
Subject to the exclusions, limitations, terms, conditions, and eligibility requirements set forth in this limited warranty, RelaDyne, Inc., a Delaware corporation, will reimburse you at reasonable cost for the repair or replacement of the engine parts listed below that fail as a direct primary result of lubrication related failure while the DuraMAX motor oil is properly installed. This limited warranty is available to the vehicle owner or lessee of an Eligible Vehicle who has their oil changed by an automotive center, commercial oil change facility, or auto dealer who uses synthetic blend, high mileage, full synthetic, and advanced full synthetic DuraMAX motor oils (henceforth referred to as “DuraMAX motor oil” where the category is not explicitly specified).
I see no red flags in using this oil -
https://duramax.com/products/motor-oils/
The prices of things are a bit nuts. Super Tech was about $14.67 for a 5-quart jug for a long time. Like most synthetic oils, it is over $4/quart now.
This Duramax oil is cheaper than Super Tech was before inflation hit.