Module showing one product

Is there a way to show only one specific product? I tried to use the content module, but it doesn't provide the option to select only one product (you have to select a category).

You can use that :
www.hikashop.com/support/support/documen...-product-insert.html

Wow, great option! But.... I only see the buttons when I create an article, it's not shown in the editor when creating a custom HTML module. Is this correct?

Yes, you'll only be able to add products through Joomla articles.