So, just to let you know that there is option that you can use:
1) Go to my profile and find the classified tab
Advertising your sales within the forum

2)Just click to the number of advertisements you've ad

3)Copy the link and paste it to the signature area.
Using BB codes you can write something like: " My current sales"
Also you can send this link to the friends or customers- they will easily access to all your sales.
Good luck!