I am in the process of creating V3 of my Tiny Low Cost BLE project. The previous designs have been easy to use, small, but are not low cost enough. Version 3 will hopefully be using the DA14580 chip, it will be even smaller than the Simblee, even more low power friendly, and be at least half the price. The only sacrifice is going to be easy of use, as this will not be Arduino compatible.... unless someone wants to join the project and take over the coding side of things?
This version is going to take some time, probably a few months depending on my available time, but please feel free to ask for updates to help motivate me to get a move on :)