Besides having your own hobbyDB Store there are a number of ways of promoting your items for sale.
Share all your items for sale
The easiest way to find a link to all items you are selling is in your Showcase -
Sharing a certain Section
Say you want to promote a series of pins or Honda models you are selling you can use the above link and search over it using all of our search terms and sort orders (for example the Boolean search explained here) -