Parts for my ONN wireless Keyboard and Mouse
Guys, did you READ the question? Bruce has lost his ONN USB Nano receiver, that is all - he is looking for a replacement.
I searched everywhere, and found no replacements. ONN has a website for numerous ONN replacements items, but no NANO receiver/dongle. I did find a wireless mouse for $.03, YES, 3 cents, at Walmart - it's an ONN brand https://www.walmart.com/ip/Onn-Wireless-Mouse-Fuchsia/292577928
If there are any available at Walmarts in your area, it's worth $.03 to buy it and see if the dongle will work.
Your post is a year old so you may not need one any longer, but if you still have your keyboard and mouse, it's worth a shot. I have lost mine also.