If your not interested in paying, got to RSbuddy.com and download their bot.
Register an account, hit download, click accept terms, download, save it to where and make sure you change the ending to .jar
You can then download FREE scripts that are actually pretty damn good.
Heres a guide:
Top right it says "Hi Unregistered" click "Register"
Enter your info
Go back to RSbuddy.com
Click download, accept terms, download.
Save it to wherever you want, and change the ending to .jar
Then you can go here http://scripts.rsbuddy.com/
to get free scripts, just log in and hit "add to rsbuddy"
Then open the client and add your user/pass (you can use a false one, and manually login) and then click start scripts (at the top right).