Good value Eurorack patch cables and passive eurorack splitters.
PolarNoise Value Eurorack Patch Cables - 5 mono 3.5mm TS cables (65 Options)
Rode SC11 Right-Angle 3.5mm TRS Y-Splitter Cable (10.9″)
PolarNoise Midi A to B adapter 3.5mm TRS Cable : Musical Instruments
TRS to Dual Mono Splitter Rattlesnake Cable Company
Eurorack Patch Cables - Many Length and Colour Options - From £7.49
ExcelValley - Right Angle Mono Modular Patch Cables TS 3.5mm 1/8 inch Eurorack Synthesizer [10-Pack
Hosa YMM-261 3.5 mm TRS to Dual 3.5 mm TSF Stereo Breakout Cable, Black : Electronics
3.5 mm TRS to Dual 1/4 in TSF - Stereo Breakout
Audio Cables - Signal Sounds