Finally got arenabg.com working for myself. Both the site and the tracker.
Here's how -
1. Access www.arenabg.com thru this proxy:
2. Right click on torrent - save as and save the .torrent file
3. Open with your client - Tracker will not start working and will show error if you are not from Bulgarian ip.
4. To get tracker to work - In utorrent
a) Preferences > Connection
b) Proxy server > Type:HTTP, Proxy: 184.108.40.206 Port: 8000
c) Leave Authentication and the rest unchecked
5. Right click on the torrent and Update tracker - should start working - atleast it did for me.
Note: This might be a very crude way to use a proxy. Since I have never had use for it before I just used the most obvious way possible. If someone has a better way please do post it.
Also multiple people using the same proxy may get us banned. Still I thought I had to share this info here. If someone can find more Bulgarian proxies and list them here, or let us know what is arenabg's policy on this, it'd be great.