Indeed there are. I fancy the challenge of etching my own for a small number of prototypes.
If there's enough interest then I'd get a bigger batch made up. I see there is one UK based company who actually has the work done in China or Singapore. From memory they worked out to about £3 per NF board if you were ordering a few hundred I think.
For me the only doubt I would have would be supplying the right files for a commercial production run out of the KiCad design.
Regards
MonkeyThink
I looked at the NF rev7 and eventually came to the same decision as you.(It becomes a big investment risk to go commercial)
The prototype would have been interesting though.
If you do go ahead please keep posting.
DYI/making your own miners is always the most fun

Here is an example:
As for:
vs3 - I'm assuming it's a 2 layer board and that the back is just ground? Thinking about the viability of etching my own boards

I got a bit lazy with v2 - there is one track on the back

I already got an idea on how to take care of that (in version 4 .. if we make it that far at all.. as that's going to be pretty much the only improvement and I'm not sure it's worth the hassle)