No joke, go find some 40 or 50mm fans, and make some ducts for them out of paper and find a way to stick them onto your print head. The best ducts I've made have been out of paper, it's a fantastic material and is so easy to modify. Also, centrifugal fans seem to be popular, I ordered a pair of 50mm centrifugal fans off of Amazon a few days ago, so I'll be experimenting with those soon.
Something as simple as a long paper cone with a 50mm fan shoved into the end of it will make an amazing improvement to print quality. I could print this guy with my paper cone fan: [
www.thingiverse.com]