The KGO is a good device. I got mine at Dark City Vapor, but there are quite a few vendors that carry it. The kits vary in the accessories that are included. Check out Sweet-Vapes, Hoosier E-Cig Supply, Northwest Vapors, Elite Vaporworks, or Virgin Vapor.
Another option would be putting together an eGo Twist kit. Sweet-Vapes is the only place that sells it as a kit, but it is pricey there. Every other vendor I have seen just sells the individual
batteries and parts separately. Most vendors are carrying it, but the best prices I have seen on them are at Ovale or Vaperite. You just need to buy the wall adapter, USB charger, and a matching cone. It should come out to around $60 for all of it.