I have a proposal to take on Amazon Go (http://www.amazon.com/go) which is also still a beta launching this year.
The implementation is IoT heavy and will need quite a bit of funding. However, the pilot can be accomplished quickly and within $10,000 or thereabouts. All tech is already available but nobody has yet synthesised it into a project.
I had proposed this idea to a company I was working for in 2015, however, they had neither the funds nor the risk-appetite for it.
With the right funding and backing to tie up with various component suppliers, the scale up to break-even could be as short as just a couple of years.
Hoping to hear from you...