Have been looking into these myself. There’s a good variety to choose from just depends on how much you want to spend. Most of the cheap er units aren’t going to cool well enough in the summer to keep milk or fish etc for very long.
Here is a good review article
When ice just isn't enough, a powered cooler is perfect. We researched 60+ top options available before purchasing the 10 best models to test side-by-side...
www.outdoorgearlab.com
One to consider as wel not listed, they have different sizes
Buy VEVOR 12 Volt Refrigerator 45L(48qt) Fast Cooling Portable Freezer with App Control(-4℉~68℉) Car Fridge with 12/24v DC & 110-240v AC for Travel, Camping and Home Use, 48 Quart, Black at cheap price online, with Youtube reviews and FAQs, we generally offer free shipping to Europe, US, etc.
m.vevor.ca
If they list a wattage you can divide that by 12v to get the amperage draw.