Most of the consumer stuff is crap… only system I'd suggest is with openephys, but at this point youd have to buy the cap/electrodes separately putting you at a $3-5k range for 32 electrode setup, which I have to say is a lot better than the $100k+ systems researchers are used to and like to use for a reason.
No I haven't, but here are the datasheets for the parts used in the OpenEphys acquisition board[0], I'm sure they could be swapped out for other parts given anyone's particular constraints. To assemble from scratch the acq board, they are saying it will cost about $1k[1].
