How do sweet deals from sites like DontPayFull.com work? On-site, we have a pack of portable systems coupon codes, portable systems promotional codes and portable systems discount codes. For the portable systems offers and extra items, you can get equivalent coupon codes as well. When you visit the online shopping site where you are making a purchase from, all you have to do is key in the coupon code. It works pretty much the same practice that an actual magazine or newspaper coupon does. Once the code is applied, you can get a sure ratio off the original price - which means substantial savings for your online shopping purchases!