+1 on that, as it applies to just about any "retrocomputer". Up to about a decade ago it seemed like you could get up any Saturday morning and randomly drive around the neighborhood for less than an hour and find a garage sale featuring some interesting piece of 8-bit technology that had been hiding in a closet for a few years. The pickings are much slimmer now. It seems like that they've "all" ended up either in the garbage or in the hands of people who actually think they're worth something. Perhaps estate sales are the way to go now. :^b
As to surplus, back in the early 1990's I used to regularly pick up government surplus IBM PCs and XTs for between $5-$20 a head, depending on what they came with, and set them up for low-income people to use for basic tasks. (An XT with an indestructible surplus Epson printer was a fine-and-dandy word processor and small-business accounting system... at least compared to the alternative, which was "nothing".) Memories of just how cheap and how common they were makes it seems completely crazy to me that people have the gall to ask well into the hundreds of dollars for a "collectors item" example now. But... apparently someone buys them at that price. (Although, come on, you'd have to be certifiable to pay this for one. Sheesh.)
Be thankful that Apple II's are still as affordable as they are, I guess. :^b