tradesouthwest

Woocommerce add-to-cart addon adds duration or increments to products and calculates the amount which is added onto said product.
Adds duration fee by number of days or any other incremental value to cart, checkout, product, admin and email invoice. Adds Additional Fee price to the cart based on any increment or duration you choose. Increment can be a price per day, a service fee, a rental time in hours or days, a length of material, a length of athletic run, a time allocation of any sorts, number of buttons attached to each dress, just about anything you can think of can be applied to each and every product. Just leave the amount blank in the product data fields and calculations will be ignored.
This plugin is pretty much just the opposite of a Discount or Price Reduction plugin: it will add and multiply the increment to the product depending on how many increments are selected. You can order a Green Widget with 7 days rental and at $10 a day you will be paying $70 dollars on top of the product cost. This additional fee will show in the cart totals and in each cart item product field just next to the product price. <a href="http://coderisk.com/wp/plugin/unitizr/RIPS-xBEUAq1yJ7" rel="nofollow ugc"></a>
<h3>Features</h3>
<ul>
<li>Set value of increment in every product separately</li>
<li>Auto sense your currency symbol</li>
<li>Custom name your custom item’s duration </li>
<li>Can be use for number of days, hours, any given duration</li>
<li>Option to turn off requirement of adding duration to cart</li>
<li>No strings attached simplicity setup and configure</li>
<li>Adds data to admin order panel</li>
<li>Sends additional text with email invoices</li>
<li>Allow for tax rate separate from the product tax rate</li>
<li>Help and Instructions built into admin page</li>
<li>Alter text in cart, checkout, email and admin to accomodate</li>
<li>Set tax rate for entry separate from product tax rate</li>
<li>Adjust positions of text on cart and product page</li>
<li>Full instructions in admin panel</li>
</ul>
Demo link: <a href="https://unitizr.com" rel="nofollow ugc">Demo for Unitizr</a>

Unitizr

Woocommerce add-to-cart addon adds duration or increments to products. Opens in Settings > Unitizr

Slashdown

Resell returned, open-box and B-stock products directly in WooCommerce. 
Manage returns, recover lost revenue and reduce waste with this free plugin. 
<a href="https://slashdown.net/obd-demo/" rel="nofollow ugc">Check out the demo →</a>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/j76XU87kNIA?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Video includes premium functionality as well: <a href="https://woocommerce.com/products/open-box-deal-premium/" rel="nofollow ugc">Learn more →</a>
With this plugin you can easily: 
* Create dedicated “Open Box Deal” products linked to the original item. 
* Add product photos of the returned item. 
* Offer a lower price to attract buyers while recovering lost revenue. 
* Keep your main catalog clean: Open Box Deals don’t clutter your shop loops.
This plugin is perfect for stores that want to reduce waste, improve sustainability, and maximize profit from B-stock or second chance products.
<h3>Free vs Pro (Premium) Features</h3>
Free version: Create Open Box Deals for simple products. 
Premium: Adds support for variable products, condition templates, visibility control, advanced settings and priority support. 
<a href="https://woocommerce.com/products/open-box-deal-premium/" rel="nofollow ugc">Learn more →</a>
<h3>Create Open Box Deal</h3>
<ol>
<li>In your WordPress Admin, go to Products > Add New Product.</li>
<li>Enter the Product name of your Open Box Deal product. This will be displayed on the product page and in the order summary.</li>
<li>Scroll down to the Product data section and ensure that Simple product is selected from the dropdown menu.</li>
<li>Click on the Linked Products tab within the Product data section.</li>
<li>Click on the dropdown under Open Box Deal Main Product and search for the product you want to link this Open Box Deal product to. 
Optionally, add a product image specifically for the Open Box Deal. If no image is selected, the default image from the main product will be used.</li>
</ol>

Open Box Deal – Resell returned products and B-stock

Open Box Deal for WooCommerce allows you to resell returned products that can no longer be sold as new.

Unitizr vs Open Box Deal – Resell returned products and B-stock