After my build is almost finished:
(living in Germany) I’ve spend about 75€ for electronic parts (resistors, caps, ics…), wires, standoffs included (reichelt + 3-4 parts from ebay)
30€ for pots and switches (tayda)
and about 25€ for some nice bakelite knobs (musikding).
If you are able to make the case/panel on your own, and have a psu lying around somwhere you can build a Lyra8 for 250€ (~300$) including the kit.
hope that helps