EVAN token is not yet listed anywhere. It is used for installing MainSale and registering the vendor. Normally, an evangelist would buy EVAN tokens which she would then resell to a vendor as a territorial license to use MainSale. At this time, as a promotion, EVAN tokens are free. However, it is not on main net as yet. We still have it in the Ropsten test network at this time. We will announce when the EVAN token becomes available at an exchange, but this is not an issue while EVAN tokens are still free.