Where to buy an Apple keyboard dongle?

Do you mean for an old ADB keyboard to convert to USB?

If so, I only found a couple, and they aren't cheap.

https://www.ebay.com/itm/303911052719

https://www.drakware.com/shop/p/adb2usb

TinseltownEda Said:

"Where to buy an apple keyboard dongle?"

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Buying a Dongle:

If looking for a USB Bluetooth dongle, you'll find one at your local retailer.

TinseltownEda wrote:

Where to buy an apple keyboard dongle?

What exactly are you trying to connect to what?