The last year especially has seen a lot of stuff come out of the closet and put onto the market. The repeal of the LGR was definitely good for that.
This happened for several reasons, the most important one being that many older people are selling off some of their collections or tiring of keeping them as safe queens.
We get cycles like this, off and on every 3-5 years.
Just wait until the cheap milsurp 8x57, 7.62x39, 7.62x54 etc dries up. The prices of those latest milsurps will drop like a stone, for a while. Then they will come back up again as new made ammo comes in to fill the vacuum.
Watch and see what will happen to handguns if we can ever persuade them to relax their rediculous calibre and length prohibitions.
I have been collecting and shooting since I was 6 years old. I collected and shot everything that went bang or could be made to.
I loved the abundent milsurp that used to be available. My preferences in what I was going to buy, had a lot to do with the cheap ammo available. If you bought enough of it, you could pick up pistol ammo for a penny/round. Mind you, you needed to buy a half a dozen full pallets of each cartridge being offered at the time. Rifle ammo could be had for 2cents/round, again, only in mass quantities and you could guarantee, all of it was corrosive and some of it had to be broken up into components.
For instance, I really hated some of the 303 and 8mm that was dated from the thirties. It was usually not very consistent, not stored well or a lot of other things to worry about. I had a metal plate with appropriate neck and shoulder holes reamed into it and marked for what they were for. I would heat up this plate on a camp stove and insert the bullet end of the cartridge into its appropriate hole and melt the sealant in the necks so I could pull the bullets easily.
Of course, the cartridge case and primer would go for scrap brass, if they were brass. The 303 was a pain because it had to be burned to get rid of the cordite which was inserted into the case, before the case was formed.
The more recent surplus ammo is much more expensive but it's also much more reliable.