$380 + shipping. Used for two months. Thought I was going to sell my iPhone 6 but had it replaced by insurance with an iPhone 6s 128GB so I'm keeping that and selling this. This phone is $400 direct from the manufacturer, but I'm offering something that is currently out of stock and an additional quick charger which runs ~$30-40. If you haven't heard about DASH charging it is extremely quick and I'm struggling going backwards to the iPhone. Having a quick charge option really changed how I went about my daily routine and having two chargers was useful (one at home & one at work).
This phone is really nice and while it did get some negative press for the screen I never found it to be bad. Maybe because I was coming from an iPhone it didn't bother me. The iPhone screen brightness was better but I enjoyed how large the OP3 was yet is thinner and felt more manageable than the iPhone+. The build quality is on par with something like an iPhone even though it is much cheaper and offers more.
For those who do not know about the product it is similar to a nexus device in that it does not have a lot of additional bloatware on the product, but it is running a separate branch of Android called Oxygen OS (OnePlus' tweaks on top of Android). The OS offers minor, but useful tweaks like buttons that have user defined functionality, color themes, and gesture controls.
Video describing the phone: https://www.youtube.com/watch?v=ycIpOZY03OM
Website showing the phone: oneplus.net/3