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Best Choice SING F LTD 
SING F LTD 4X 1-Channel PC817 Optocoupler Isolation Module (3-5V) Suitable for Photoelectric Isolator Signal Ssolation 1-Channel PC817 Optocoupler Isolation module adopts 5.0 pitch screw terminals for easy wiring.EMSea 
EMSea 2Pcs Optical Isolator Module Voltage to Current Converter Module Input Optoisolator 12V 80KHz 1 Channel PC817 EL81 It is made of premium material, which is not easy to wear and comfortable to touch.
10Pcs Transistor Output El DIP-8 6N137 Optoisolators Ic New ys 10Pcs DIP-8 Transistor 6N137 Optoisolators Output El New Ic.Best Value SING F LTD SING F LTD 4X 1-Channel PC817 Optocoupler Isolation Module (12V) Suitable for Photoelectric Isolator Signal Ssolation an 1-Channel PC817 Optocoupler Isolation module adopts 5.0 pitch screw terminals for easy wiring.
NOS QTY 54 Global Optoisolators H11D1QT Optocoupler (DIP-6) L3-1 THe quantities are appoximate. No exceptions.YINETTECH 
YINETTECH 4Pcs VTL5C3 Opto-Coupler VTL5C DIP-4 Audio Opto-Coupler (Vactrols) Linear Opto-Isolator Suitable for Many Guit DONGKER 
Optocoupler Isolation Board, Signal Converter Module Voltage Level Current Voltage Converter Module 80KHz 1-Channel Opto ❤Isolation Voltage:more than 3000V . Input Current:50MA(MAX). Operating Current:more than 1MA. Output Maximum Current:5013% Off 10PCS IC MOC3061 DIP-6 Zero-Cross Optoisolators Triac Drive NEW GOOD QUALITY Module, crystal oscillator, relay and all kinds of electronic.Beufee Optocoupler, 4 Channel Optocoupler Isolation Board Optocoupler Isolation Module Optocoupler PC 817 Optoisolator Module PRACTICAL: Optocoupler can realize 3.3V or 5V to control the interface of 3.6 to 24V voltage. 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