I'm sure DECN would work out a deal that they would make a good profit on quantity. Once one of your major retailers stocks Genstips the rest will fallow. Not only fallow but chase DECN for their business, or they'll lose customers to their competition. I'm sure you already know that. imo.
While Walmart may squeeze price it's a constant formula where Walmart gets 70% of the sales price. This is for all companies so whether the company is big or small only matters as it effects the margins of that specific company. It's a similar model to the apple stores. So if you have a high margin product and can maintain profits Walmart becomes your biggest marketing vehicle while paying for itself and generating some profits.