Spreadshirt offers 2 sales channels - the Marketplace and your own Spreadshop. I am using both but just started my Speadshop last week to have more control over the layout. They were kind enough to offer all my customers 15% off for 2 weeks, which is great but the only 2 purchases were from me even though I'm promoting on Twitter, Facebook, and via 2 YouTube videos. Any thoughts about good strategies I may be overlooking that could get my merchandise more attention?