Shellbot

** 07/06/18 – Updated for the latest version of WooCommerce **
By default, WooCommerce displays a neutral and uninteresting category image placeholder in those cases where a category has 
no explicitly set thumbnail. This plugin simply replaces the placeholder image with a product image from that category.
User can choose whether to use a random product or the latest product from that category.
Feature requests welcome, please <a href="https://wordpress.org/support/plugin/woocommerce-auto-category-thumbnails" title="Plugin support forum" rel="ugc">post in the support forum</a>.
Usage
There is no complicated setup, simply install the plugin and configure WooCommerce to display categories. Any categories containing products but without a 
category thumbnail will now display a product image.
To switch between random and latest product display, see the settings page under WooCommerce > Settings > Auto Category Thumbnails.
More options coming soon. <a href="http://codebyshellbot.com/wordpress-plugins/woocommerce-auto-category-thumbnails/" title="WooCommerce Auto Category Thumbnails" rel="nofollow ugc">Plugin release page</a>.

WooCommerce Auto Category Thumbnails

Replace the default WooCommerce category image placeholder with a relevant project image instead.

MohammadJafar Khajeh

You can specify a minimum quantity for a product. When the user adds the product to the cart and if the number of wanted quantity was greater than the minimum you specific, the price of the product will change to what you want. 
That price can be a percent or a specific value. 
This is wholesale.
<h4>One more thing</h4>
The plugin using i18n, So you can translate it for your language. 
The plugin has been translated to Persian already.
<a href="https://github.com/mjkhajeh/woocommerce-wholesale" rel="nofollow ugc">GitHub Repo</a>

Wholesale

Changes the price of the product in the shopping cart according to its quantity

WooCommerce Auto Category Thumbnails vs Wholesale