Comment by sudosteph

Under $100 - A portable neck cooling fan with semiconductor cooling pads on it

They sell these all over Amazon and similar places, but the best ones have both the moving air components and at least one little metal strip that rests on the back of your neck. That metal strip gets very chilly, so it makes hot weather so much more tolerable! Only downside is it's not great for long hair due to the fans potentially catching strands.