Comment by tw1984

there are good deals on ebay atm. e.g. brand new ublox zed-f9p dev board pin compatible with the M8T receiver you are using. it also comes with dual frequency antenna. it is not a second hand chip, but a brand new module ready to be plugged into your system.

www.ebay.com/itm/277500530946

I usually buy my second hand electronics stuff from www.goofish.com, the home base of all those "From China" ebay vendors.