Part of the resin for these items is the price. I found them on sale at NWVapes.com. The e-pipe is $29.99 for the kit, the istick 20 is $25.99, and the Davide BCD are $9.99 each. The coils can either be Kanger or Aspire, but are roughly $2 each.
My total bill will be around $85 and that qualifies for free shipping. From all the sites I've searched, that can't be beat. As a self-employed artisan broom maker, price is an issue
Another note... I live in a very rural area, and so there are no vape shops for me to visit for advice. It's you guys and YouTube...
Price is always a good reason. I'm going to have to check out this Davide BCD...never heard of it before you mentioned it. Sounds like a winner.