$6.90 - 40 Pin Jumper Cable: Male to Female - Tinkersphere
Amazon.com: Xiaoyztan 40 Pin Flexible Flat Ribbon Cable 0.5mm Pitch FFC FPC for LCD TV Car Audio DVD Player Laptop (200mm Length, Pack of 20Pcs) : Electronics
I-PEX 20455-40P-D8 LVDS Cable 40 Pin 0.5mm Pitch 1CH 8BIT For 10.1″ LED Display | eBay
40-Pin IDC Ribbon Cable to DB37 Male, 6 Inch Length - Sealevel
20453-20455 Series 40 Pin LVDS Cable 2 Channel 6-Bit For LED LCD Display | eBay
$3.49 - Extra Long 40 Pin GPIO Cable for Raspberry Pi - Tinkersphere
Plc-40p Connector Mil Data Cable 40-pin Terminal Block Plc Connection Line With Connector 40-pin Adapter Board Plug - Pc Hardware Cables & Adapters - AliExpress
uxcell 2.54mm 40-Pin Female to Female IDE Flat Ribbon Cable 20cm 2 Pcs: Amazon.com: Industrial & Scientific
40-Pin IDC to 40-Pin IDC Ribbon IDE Cable, 18 Inch Length - Sealevel