I bought my own slide scanner (true 50 megapixel resolution) a few years ago and scanned something like 5,000 family Kodachrome slides from the 1950s through the 1990s. The scanner is good enough that I can see individual film grains on some of the scans of high-ISO film. Took a LOT of work and time, especially doing color corrections and dust removal, but now all those old slides are all uploaded to a Google Photos account and available to all my family and siblings. Well worth it. I think I went through something like 20 cans of spray air, too...