Yes, and I'm surprised that more of them aren't available.
Because the size of the case is smaller than that of a .44 mag, the gun itself is heavier because of the extra steel. And being a Ruger, it's not that the extra strength actually delivers anything extra. I had one of these gems back in the early 80s, I think, and I recall it was a fabulous gun. But as I learned to respect the .357 caliber more, I saw less of a need for the .41 as a self defense piece. I also saw the .41 as a bit redundant for those who needed a good hunting revolver. In short, most people I knew who owned and loved the Ruger Redhawk .41 did so because they couldn't put their chubby little fingers around a .44 magnum at the time, especially a stainless .44 magnum. Since there's really very little difference between the two in many peoples' eyes, the gun just sort of lost steam as .44 magnum revolvers became more available.
I well remember the day my own S&W 629 got in. I'd been on the waiting list for what seemed forever and the dealer had it in the display section so people who had never seen one could gape at it as if it were some saintly relic. The gun was just like the somewhat rare 29, but it was stainless steel! Even the sights were stainless and the hammer and trigger, while not stainless, weren't MIM and besides, they were flash chromed. But I needed to sell my .41 Redhawk because why have both .44 and .41 ammo kicking around? I already had my .44 dies and was ready to rock and roll.
By then, also, the .41 had completely lost its luster, and as more .44s became available, fewer .41s were selling. It was fairly clear that the .41 wasn't going to dethrone the venerable .357. The .357 was smaller, easier to handle in powerful loads, was completely competent in its field and a voracious manstopper. The .44 magnum was already an institution and just didn't need a kid brother. It couldn't seemingly find a comfortable nitch. All my friends who had .41s unceremoniously dumped them as soon as they could get the .44s they'd really wanted all along.
So this may be the reason they're hard to find. True, they had flat trajectories and packed a .44 wallop without being so hard on the shooter. I just don't think many people had confidence that the gun had a future. If the ammo companies had really jumped on it, I think it could have worked. But Elmer Keith was still alive back then and he certainly wasn't going to let anything threaten the legend he'd created. There was also the nagging question of whether the ammo would be available in 10-12 years.
So all this has affected the availability of the .41 Remington Magnum. Back in my days as a dealer, I'd hawk the SHOTGUN NEWS looking for .44 mags and see only photos of .41 mags, which they were practically giving away. But here we are today, years later, and if I had a .41 5-inch Redhawk sitting in my safe, I wouldn't get rid of it. Maybe others have the same idea.
Good luck, though.