how to buy the brand free option

there are two issues :

1. we have already purchased three mods i.e vbInfoPanel, vb Activity, VbAdvancedthanks.
Unofrtunately, we never got any discount

2. How to purchase "brand free" option for InfoPanels? how much does it cost and where to purchase?

Branding Free for InfoPanels can be found here: http://www.dragonbyte-tech.com/vbecommerce.php?do=purchase&act=product&id=4&addons=1, if you click "Addons" for any product you should see branding free unless it doesn't apply

In regards to discounts, unless you buy a bundle or use a coupon code there won't be one.