I am using a Verizon aircard and my subnet has been banned from Craigslist. Is there anyway for me to change or disguise it so I can post again? Thanks.

Just use a proxy. There are plenty of guides on how to, but since you aren't looking for anonymity, just un-bannedness, you could set up an SSH or VPN server easily enough at your house and then just forward or connect to that.

The easiest way is probably just ssh tunneling (you can google that if you don't know what it is).

Would you mind pushing me in the right direction with ssh tunneling? I Googled it, but still can't seem to follow all the computer talk/directions. I need a basic guide on how to do it. Maybe you know a good site or forum? Or if you had the time can help me. Please let me know. Thanks!

Install sshd on a box at your house and forward the port.

then, when you want to use it as a tunnel:

ssh -D <port number you want to use as a SOCKS proxy> user@host (-fN if you don't want to log in).

Or, if the app doesn't support SOCKS proxies:

ssh -L <local port>:<host you want to connect to (craigslist)>:<host port> user@host -fN

Awesome. Thanks man.