Andrew Munro

This plugin requires <a href="https://wordpress.org/plugins/woocommerce/" title="WooCommerce" rel="ugc">WooCommerce</a>. It allows the site owner to prevent a product from being purchased by enabling a checkbox. It also allows you to override the message on a per-product basis. This will be useful for when you want to let customers know a product is only available in-store but still have the product listed on your website.
How does it work?
This is a very simple plugin that hooks into WooCommerce’s woocommerce_is_purchasable filter. When a product is deemed unpurchasable the “add to cart” button on the main product listing is replaced with a “read more” button. When the customer views the single product page they are shown a message that the product is not available for purchase and the add to cart buttons are removed.

Prevent Purchase for WooCommerce

Easy Digital Downloads

This plugin requires <a href="https://wordpress.org/extend/plugins/easy-digital-downloads/" title="Easy Digital Downloads" rel="ugc">Easy Digital Downloads</a>.
This plugin does one simple thing. It will prevent a customer from being able to checkout until the minimum cart total is reached.

EDD Prevent Checkout

Prevents customer from being able to checkout until a minimum cart total is reached

Prevent Purchase for WooCommerce vs EDD Prevent Checkout