Like Jack, I also prefer to use mods that can carry the 18650 batt. I use Reo Woodvils and a SS GGTS + UFS. I vape constantly so battery life is pretty important to me.
I order atomizers and cartomizers from Ikenvape, juice from Vaperite and FreedomsmokeUSA, and also order from Chinese vendors like Heaven Gifts and Healthcabin.