When I did a presentation on RISC-V last year I counted 6 real implementations (full custom ASICs). Now granted only one or two of those you can buy, the others are research projects, but they do exist and they did produce real silicon. This year we should see a couple of 64 bit implementations, which is when it'll get really interesting.
There are of course multiple FPGA implementations (I have one about 2 feet away from me now), but they are very slow.
What kind of for free are you talking? The first commercial run RISC-V microcontroller SoC has fully-published RTL, and a company which will support you in adding it to your products (SiFive). Obviously people aren't going to give you the manufactured chips for free, but how close do you want it?
There are of course multiple FPGA implementations (I have one about 2 feet away from me now), but they are very slow.