Currently for buying and selling Bitcoin we use two different methods.
For online sales we offer a few choices
The best bitcoin trading website is currently www.bitwallet.cc
A good 2nd choice www.LocalBitcoins.com
For local cash sales we recommend Mycelium (http://mycelium.com/)
Its a great little app for Android phones that is fast and secure.
At the moment we offer local cash sales in the following cities:
El Paso, TX