None of this will be of any help to you
"Where did you get yours, and how much did you pay?"
I got all of them from a guy I work with. I don't remember exactly what I paid but none were more than $100.
A note on the M39. I knew my rifle (a VKT) was accurate, but I wanted to see just how accurate it was. So, I ordered a scope mount from Darryl and put a scout scope on it (this is a no-gunsmith scope mount that doesn't require you to damage the rifle to use it). My VKT shot five rounds that could be covered with a quarter at 100 yards. Unforunately when the barrel heats up, the rounds start to string vertically. I then took off the scope and reinstalled the issue sights. I have shot that VKT a lot with handloads. I have spent a lot of time playing around with very light handloads using cast bullets that make almost no noise at all.
"Same question for your '03"
Bought it from a local dealer last week for $400. I owned a couple of them about 15 years ago but foolishly sold them both (selling guns is stupid). Now they want real money for them. I hesitated to ever spend that much on an old milsurp but this one was really nice; flawless. And, I had just worked some serious overtime so I splurged. You can get them for the same price from the CMP.
"Couldn't you "fix" that just by looking at ballistics tables and figuring out how high ..............."
Sure. But, I just shot them to see where they hit. But, it is kind of a PITA to me to have to use "kentucky windage" ALL the time. I mean, I don't shoot at 300 yards and further all that often. These Vintage Military Bolt Action rifle matches usually have targets out to 400 meters, but most are closer. Contrast this with the K31 that has a 100 meter sight setting or the 03A3 that as actual adjustable sights.
Sorry I can't be of more help, but I don't have a C&R license. I just buy this stuff when the opportunity presents itself. Most of the stuff I own, I bought from a guy I work with that has a garage full of it. Then I also have a real good relationship with a local gun dealer. I have spent a LOT of money in his shop over the last five years or so. When I was really hot for these old milsurps he ordered me several of them for cost.