Windscreen, Wind Jammers, Softies, Dead Cats/Kittens - whatever they call some of these things, they can run you a pretty penny. If you're familiar with Microphone Windscreens then this next product might look very similar to other high end stuff. While the 'other' guys can charge upwards of $280 dollars, an equivalent MiCover Windscreen can run you just about $70 bucks. Not always that great in savings, but normally you'll be looking at 40-50% cheaper than the other brands. Depending on the microphone you have, simple SlipOvers can run you around just $20 bucks.
How well do they perform? I haven't had the chance to test just yet as i've been busy, but I can tell you that it will work way better than the stock foam. The build quality is very nice with a rubber ring at the tail end, internal foam that looks to be of quality acoustic material, and a furry outer coat. If I have time today, i'll run a quick 'microphone against the fan' test. You can find them in a limited amount of online websites, biggest one being eBay. Available in a Puffin or SlipOver for some microphones that are already built in to Pro Video Cameras. A variety of sizes should fit the most popular accessory microphones from Audio-Technica, Azden, Canon, JVC, Neumann, Panasonic, RodeRoland, Sennheiser, Shure, & Sony. You can find more at their eBay store following the link.