I had good luck with the web page Siemens. There one can maneuver the automation.siemens.com web page and then
> Automation Systems > SIMATIC Industrial Automation Systems > PLC > LOGO! Logic Module
There is one link for "Contact & Partners" in the extreme right of the screen.
I see you are in Bolivia and there are two sales offices in Bolivia; La Paz and Santa. The web page offers telephone numbers and email addresses for the vendors.
Also there are many downloads free and other product information about LOGO! on the web page Siemens.