ASUS WL-138g V2 ($20-35)
Though it has been officially discontinued, you can still easily find units of the WL-138g V2 on sale across the internet. Compared to its higher end counterparts, it's still one of the cheapest Hackintosh-compatible adapters on the market. Admittedly, the WL-138g V2 isn't winning any races in terms of speed: the data rate of the WL-138G V2 tops off at 54 Mbps, which is far lower than the maximum speeds of the newest adapters. In addition, it doesn't support the 802.11n network standard, and can only operate on a single frequency band. But that's besides the point: none of this really matters if you just want a cheap and easy way to get WiFi working on your Hackintosh. The WL-138g V2 can do that for you.
SEE ALSO: The Best WiFi Adapters For Your Hackintosh