I got a little Guitar Preamp board at Aliexpress, for $4.55 shipping included.
It uses a TL072 dual JFET op-amp, the board may be designed for 12V, but the chip spec suggests 4.5 V to 40 V operating range. (Have not tested mine) plug for the 3 pin connector soldered on the board I received, was not included.
Other sellers do include that single ended power & signal out cable.
