I picked up a Zyxel MWR102 for about $30. What I like about it:
1) Inexpensive
2) very small
3) USB (mini) powered so I don't need a separate power supply
4) since it doesn't need to be directly plugged into the wall, easier to position near RJ45 plug
For me it's a backup device as I have a mifi hotspot. I carry it for when I don't have mifi coverage and there is no wireless internet or when my wife and I are traveling so we both need to connect (and I take my mifi to the meeting...)