I have several hundred Optek Part Number OPB810W51 slot-type opto isolators.
They are new, old stock. Some are in bags of 100, others are in bundles of 100 along with several hundred unbundled.
If you need them, you know what they are. If you don't know them, look up the part number.
I would like to sell all at once. I have well over 500 of them. Let's make a deal!
If you can read this, I still have the item.
Contact me with any questions.