Where can I purchase these “hex“ pickups from?
your hex hardware options include:
cycfi nexus*
older roland/boss gk2/3 or graphtech or rmc with a breakout cable* or gp10/sy1000
roland/boss gk5 with gm800/vg800
subsix*
* requires a multichannel audio interface
each has various strengths and drawbacks.
there’s a variety of effective audio interfaces ranging from $200 - $500. i’ve used the zoom l8 and the behringer umc1820.
A good source for new equipment is:
Used gear you can find in eBay.
Just bear in mind that only a pickup will not bring you any further (see kimyo’s post above).