Budget USB MIDI Host for an OP-1 (and such)

OP-1
#1

Submitted an hour ago by sm_op1

Just bought a Raspberry Zero board with the USB extension board (4 x USB), and use it now as an USB MIDI Host. Super! For instructions you may go here:

https://stimresp.wordpress.com/2016/02/08/using-a-raspberry-pi-as-usb-midi-host/

#2

Here is a pic:

https://postimg.cc/image/adcudng59/

#3

All additional hats (boards) are optional:

https://www.amazon.com/gp/product/B01IT1TLFQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 (USB x 4 extension)

https://www.amazon.com/gp/product/B073C3NJ2T/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1 (UPS battery)

#4

How much would you say this costs including the Raspberry Zero board?