As @bmoran4 noted, the prices in guides are essentially worthless. SOLD listings on auction sites can be of some value, but it's hard to judge condition unless you see the item in person. Keep in mind that the recent prices of postwar on auctions such as Stout's are for items in prime condition. Most MPC in any condition, and anything but the rarest postwar items below a legitimate C8 have plummeted in value in recent years. As we get back to in-person meets, it will be easier to shop around and find operator-grade stuff at reasonable prices.
And remember that some people are still stuck in the mentality of "but I paid $$$ for that in 1995" and can't wrap their heads round the fact that demand for "collectibles" has fallen. Unless you're a mental health professional, when you encounter such folks, just keep moving.
