LCSC Sub-total: $6.76 for everything for 10x boards (plus lots of spare parts) Console5 Sub-total: $14.90 for RA Female SCART connectors BOM Total: $21.66 for 10x boards
You'll want 5x of the top boards and 5x of the bottom boards PCBs: $4 for 5 top, $4 for 5 bottom, plus $6 for slower shipping = $14
Total board Costs for 10: $21.66+14 = $35.66 = $3.57 each (pretty cheap)
I've respun db_electronics' Phoenix RCA plug board to use JST headers: https://github.com/rattboi/phoenix-audio-adapter-kicad/tree/jst-xh/
$5 for 10x more boards on JLCPCB order, and $0.89 for JST headers
$5.89 for 10x populated boards = $0.59 each
https://www.amazon.com/gp/product/B07HRMWVK9/
$8 for 10(need to find a better source)
https://www.amazon.com/gp/product/B005C2KA88/
$5.39 for 10
$21.56 for 40 (4x per board, 10 boards)
Alternative:
https://www.amazon.com/gp/product/B01H1A4QAQ/
$6.42 for 10
$25.68 for 40
10x board + phoenix + cables + adapters: $36 + $6 + $8 + $22 = ~$72
$7.20 each, all parts, shipped