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You probably came across BrickLink. They sell pretty much anything LEGO related, including original boxes and instruction books.

the less sets there are available, the better the chances of a rising price. this implies the sets that will get more expensive with time are: sets that are out of production sets that are expensive when they come out (> less sales) very big sets (expensive > less sales) licensed sets like harry potter or starwars (short production-time > less sales / ...

Not sure about several years, but Brickpicker covers one full year. Here are the stats for the Green Grocer, for example: Or the ones for the UCS Millenium Falcon: Well, you get the idea. They have more and other stats, too. E.g., the following quick overview for every set: They pull their data from eBay (through some third-party tool ...

I'm not familiar with any tools that do this with eBay or Bricklink price histories. I'm pretty sure that Bricklink removes all data older than 6 months, so if this information is available, it would have to come from a third party who scraped it from the site. I have used a tool called Tracktor to look at Amazon price histories for LEGO sets. Sadly, this ...