ChrisHurst

MyWebsiteAdvisor

Allows for Free Checkout with WordPress e-Commerce Plugin. 
Can be used with 100% discount coupons and $0.00 products. 
When the cart total is $0.00 the payment form will be replaced with the text ‘Free Checkout’ and offsite checkout will be skipped.
Developer Website: http://MyWebsiteAdvisor.com/
Plugin Support: http://MyWebsiteAdvisor.com/support/
Plugin Page: http://mywebsiteadvisor.com/tools/wordpress-plugins/wp-e-commerce-free-checkout/
<a href="http://mywebsiteadvisor.com/tools/wordpress-plugins/wp-e-commerce-free-checkout/" rel="nofollow ugc">Premium Version with Advanced Features</a> including:
<ul>
<li>Available To Members Only Option.</li>
<li>Available Only To Specified User Roles Option.</li>
<li>Hide Billing And Shipping Address Forms.</li>
<li>Customize the ‘Free Checkout’ Message on the Checkout Page.</li>
<li>Lifetime Priority Support and Updates!</li>
</ul>
Learn More Here: http://mywebsiteadvisor.com/tools/wordpress-plugins/wp-e-commerce-free-checkout/
Requirements:
<ul>
<li>WordPress</li>
<li>WP e-Commerce Plugin</li>
</ul>
To-do:

Name: WP e-Commerce Free Checkout

Allows for Free Checkout with WordPress e-Commerce Plugin.

themeszone

This is a WP e-Commerce plugin that allows you to hide the price of a specific product and replace it with a message asking your customers to call for price. 
The plugin is easy to use and configure. There there 15 “Call for Price” icons available as well as an ability to upload custom “Call for Price” icons. Install it, Configure it and Rock it.
<h3>Donations</h3>
http://ecommercewp.com/wp-e-commerce-call-for-price/

WP e-Commerce Call for Price

This is a WP e-Commerce plugin that allows you to hide the price of a specific product and replace it with a message asking your customers to call for …

Name: WP e-Commerce Free Checkout vs WP e-Commerce Call for Price