Originally Posted by
Vandalf
You need to have completed Dragon Slayer to use this money making method.
It's quite simple.
If you have any anti-dragon shields in your bank, withdraw them all in noted form. Then walk up to Duke Horacio in Lumbridge, drop the shields and ask him for an anti-dragon shield. Once you have it, drop it immediately and ask Horacio for another one. Repeat until your inventory is full, bank the shields, then start again.
As of now, anti-dragon shields cost a little more than 600 coins in the G.E. That means that you could make about 16k in a few minutes. Not bad if you need some chump change.
Alternatively to this method, you could ask an SRL Member to make a script to perform this task... And pay him.