Wireless USB adapters are becoming a dime a dozen. Most networking companies have at least a handful of models, and the ability to OEM adapters from overseas in such abundance also means that a lot of non-networking companies can be found with a few under their belt too. The prices can start cheap, some being found for under $10, but when it comes to wireless networking, cheap often means a lot of frustration will come with the adapter too. Weak signal reception, poor drivers, network drop-outs, are just a few things you'll probably suffer from a budget minded wireless adapter.
Another thing to be careful with when shopping for a USB wireless dongle is size. A small and compact dongle may seem like it'll save you a lot of space, but unless you absolutely need something that is small, then bigger is still better. A bigger wireless dongle means that it has a bigger antenna - or even two antennas in the case of the one I have here today. The TP-LINK TL-WN822N is a high gain wireless N USB adapter with two external 3dBI antennas. This adapter may not be as small as a quarter, but it's still not much larger than a pack of gum which makes it easy to pack away and travel with too. Let's see how the TL-WN822N stacks for it's great price.