Not sure that this is a great deal, but I needed a portable fan, and have M18 batteries available, so I took a chance on the M18 Packout Jobsite Fan, 0818-20. $129 ("was $149") at HD and other places...

Ran it for 2 hours (at the speed setting shown in the pics) on a full 5.0 battery today, still had 4 LEDs showing when done.
We used this at a youth baseball game (in mid-80s temps, in full sun, but under a popup tent), did a decent job moving air. It's pretty bulky considering it only has a 7-inch fan blade diameter, and it would be better if it could be easily hung upside down.
I'm hoping to be able to use it in the RV at night as well (hoping it's quiet enough). It has a 120-volt AC inlet, but I most often camp without connecting to utilities.
I took a peek at the larger M18 Fuel fan (0821-20), which at 18 inches is HUGE (for my purposes), and a bunch more money ($269). I might buy one with a 20% off (or better) deal.
Mike