Though the subject matter is somewhat mature, this site is a classic example of a catalog site selling instructional videos or audios. In this case the products are audio files (MP3) which are made available to the customer for downloading as soon as the purchase has been made.
Payment processing and protected download delivery are handled by the ECWID shopping cart platform, which I configured and integrated into the site.
This WordPress site was initially constructed on a fixed width theme and recently upgraded to a mobile-responsive theme. The product catalog was laid out such that, when viewed on a smartphone, an item would fit within one screen with no scrolling, either in portrait or landscape orientation.