GPIO Ribbon Cable for Raspberry Pi Model A+/B+/Pi 2/Pi 3/Pi 4 [(40 pins)] : ID 1988 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: uxcell Forward Direction 40 Pin a Type FFC FPC Ribbon Flat Cable 0.5mm x 300mm 5pcs : Electronics
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
40-Pin IDC Ribbon Cable to Four DB9 Male Connectors, 14 Inch Length - Sealevel
40-Pin Flat Flex Cable
CABLE-IDC40-6cm
2pcs Ffc Fpc Flexible Flat Ribbon Cable 40 Pin 0.5mm Pitch For Edp Panel Same Direction With Both Ends - Pc Hardware Cables & Adapters - AliExpress
18 inches IDE Single Drive 40 Pin Flat Cable - Micro Connectors, Inc.
40 Pin GPIO Breakout and Cable (For Raspberry Pi)
6-inch 40-Pin 2x20 2.54mm-Pitch Female Female 40-wire IDC Flat Ribbon Cable - Cpu Stuff. Custom SATA Cables
Amazon.com: Pc Accessories IDC 40-pin, 40 Conductors Flat Ribbon Cable for 2.54mm 0.1" IDC Connectors, 10-Ft Length : Electronics