Try finding Water Pump grease. As in the stuff cars used prior to WWII. Yet another specialty lubricant once used by the barrel and No Longer Available.
Unless one goes to eBay and looks at Cans and Buckets for Oil and Gas collectibles. You will find it there. Oh, the sellers are trying to sell old cans, and many have not been emptied due mostly to seller laziness. That is a plus for me, because I don't want the can per se. I want what is *in* the can still. I pay too much, but later on I can clean up the empty can and recover my money. If it was particularly dirty and now I have it nice and clean, I can actually *make* money by getting my old stuff this way.

I recently saw a 5 pound can of Kendall S-831, a #3 Sodium fiber grease, go for $30 bucks shipped. Full. Still had the little swirly on the top. The seller had a pic of it with the lid off. Problem is, for this use, one has to get the sticky goo - it is like taffy - into a pump gun. As it was packaged, it was for garage use on wheel bearings. I didn't buy it as I have a couple 1 pound cans already, and I prefer the S-825 #2 version for race car and trailer wheel bearings.
You see all sorts of older stuff in the Cans and Buckets category. I saw a case of Flit cans a few months back. Anyone need 3% DDT? Still out there. People find stuff in Grandpa's barn after he no longer needs any of it and up on eBay it goes.
I did also see a 120 pound drum (16 gallons) of #3 MobilLux (I think it was Mobil anyway) for 300 and some bucks. This was in the industrial grease section. I was looking for tubes for you. If you got a barrel pump you could fill a gun. But I figured this was a bit too much shop-like for you and didn't mention it. The last time I needed to restock on #1, which I prefer to use on dozer and loader pins and steering kingpins and the like, I found an eBay seller with lots of tubes for a good price. But, I didn't see any #3 in tubes at the moment.
Stan