There are a few things you may not know about Heartsy. For one, you can become a VIP member for only $7.99 and find out about deals before everyone else and purchase before others too. Secondly, to become a featured seller is absolutely free! All you have to do is offer a discount to your customers, which they then purchase via Heartsy.
Their website says: "Customers respond most enthusiastically to large discounts - the bigger the discount, the more new traffic you're likely to see." Pretty fun stuff!