Add a button to "Request sample" on the WooCommerce product page. It is possible to activate the sample and configure its price for each product.
Plugin Tag: product sample
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Free Product Samples for WooCommerce – Try Before You Buy, Request Samples by Mail
Advanced Product Sample for WooCommerce does one thing, and it does it well. It lets you order product as a product sample.
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Document Preview For WooCommerce
This will allow you to add document preview at single product page. Which helps to offer more better idea when you are selling ebooks, pdf or some doc …