YITH WooCommerce Popup Premium:

Customise your popup windows using templates carefully designed by YIThemes for YITH WooCommerce Popup, make them become part of your site and of your sales strategies and put whatever you want in them that has to be shown quickly to your users.

Put there a contact form, a newsletter form, suggestions, and even products. Choose the page and the position where showing your popup and, which is even more interesting, make this plugin interact with WooCommerce plugin, so that you can show in popup window a specific product, a random one, one from a category and so on.

Make your offers in a quick opening window instead of forcing your users to load a new page.