>>4281318It seems to be a niche enough item that there are not many being sold on the internet/ebay. I spent a while looking at name brand loupes and settled on the rodenstock aspherical.
Nikon makes a nice one, Leica's is a basic bitch scam, I think Zeiss also makes a decent one as well. Horseman was another option..
I am very happy with the rodenstock. It is 6x with the reversible stand. The size and aspherical glass makes it a real treat to look through. I also like that it matches a couple of my 4x5 lenses, hah.