One thing that makes sopping from E Cig of Denver super easy is that they offer flat rate shipping for USA delivery when you purchase a new e cigarette. They offer concentrated pens, E cigarette accessories, eGo replacement parts and so much more. E-Cig of Denver custom mixes e-juice flavors according to buyer's preferences. The staff works with the client to create the correct taste, strength and the perfect flavor. Also the staff helps the buyer determine the right amount of nicotine. Over all it is a great place to easily tailor an e-cigarette.