Bazaar: Selling Instantly
It is possible to instantly sell items, without needing to wait for a Sell Offer to be filled.
The downside is that the unit price is generally lower compared to the unit price of a Sell Offer.
There also has to be atleast one Buy Order (the items have to go somewhere).
Here is how you do it: 
This post is licensed under CC BY 4.0 by the author.