Hi and welcome back to C/L!
If you mean nylon fishing line it's useless for C/L purposes. It has too much give in it.
There are several good firms selling C/L stuff. IMHO one of the best is [link=http://www.sshobbies.com/]Sam's Stuff & Hobbies[/link], there you can get anything you need at a good price. Also, don't forget to join the [link=http://stunthanger.com]Stunthangar[/link] and [link=http://www.clstunt.com/htdocs/dc/dcboard.php]Stuka Stunt Works[/link] forums.