Long story short: I was very disappointed to find out that only trade cities can have Bazaars. So, I propose a new idea!
GBay! The galaxy wide EBay!
In GBay, items can be listed for sale. The command to list items would be /gbay, which pulls up an Auction House-like GUI.
GBay would be much like how Bazaars work, except with a transport fee. (Transport fee can vary between regions) When someone buys an item, it is directly given to them like an auction house command. The transport fee would not be given to the seller, only the amount of the money the item(s) were listed for.
I’d like to see how this idea expands, and I hope it can be implemented someday.