It's been a few years, so I don't know how accurate this info is anymore... but
Alpicool had a tiny cult following as a poverty-friendly option for people who couldn't afford a Dometic there in the Prius camping community with their top load 12V coolers, IIRC, as they're reasonably priced for the sizes and offered a 3 year warranty on certain models. Like, 48qt single temperature zone models with battery backup for under $300-ish prices. Cheaper than a Yeti, but nothing's built as good as it used to be for the price anymore... so, YMMV.
This said, if you've got a decent cooler and you're looking into ice packs, you can make your own for way cheaper using something called
KoolerGel powder. Use it in six washed out 2qt Old Orchard/Ocean Spray boxy juice containers using DI water (to help keep things sterile and from growing anything if they're kept thawed for a while) for a dense rectangular box form factor. I've tried doing online recipes for DIY cooler gel packs, and the stuff always thawed out nearly as fast as ice. I've found the KoolerGel stays frozen/cold for a lot longer, and the size of the bottles are convenient for cooler usage. That exact set-up, in fact (the six Old Orchard bottles with KoolerGel), is what I used when I used to go camping - coupled with a modified Coleman Xtreme lined with Reflectix and insulation pucks that would fit in the lid drink holders. The longest I pushed that setup in normal usage was about 72 hours (spring in the shade) with just the six bottles, and there was still frozen chunks in the bottles and ambient was still under 40°F at the bottom, and alternately pushed that same setup during a week without power during an ice storm, and made it until day six before we lost some of the frozen meat on the outer edge with it sitting in the garage, and there was still soft frozen toward the center of the container. Inflation's been rough, but I don't think I spent more than $80 for the whole setup about a decade ago. I'd just recommend under-filling the bottles by a couple ounces since the stuff does expand when it freezes.
