You can't beat an air cooler on a budget and there's no better example of that than the superb Arctic Freezer 36. It's quiet, performs exceptionally well, and is very affordable—what more could you ask for?
Arctic has nailed the formula with the Freezer 36. I've used other popular designs from the company prior to this, such as the Freezer 34, but without a doubt the Freezer 36 is the one to buy today. A big part of that is price. You can buy a Freezer 36 for $46/£23 today, which puts it very much on the budget end of price scale—a true budget hero in the UK, if pretty close in the US, too.
