The good ones worth having are insanely overpriced (the current record holder is "Dr. Syn, Alias the Scarecrow" on Amazon at $299, followed by the Disneyland 50th set and Chronological Donald 4, Including Mathmagic Land, at $180), and the affordable and available ones are affordable and available for a.......reason.
Oswald, obviously, is going for $21.
Thanks to overprinting, however, the WWII "Front Lines" set can still be had for the $30's, Tomorrowland (and the Ward Kimball classics and Walt's Epcot City film therein) is still going for the $20's, and a few copies remain of the Rarities Shorts sets in that range.
You could get the "Disneyland USA" set for the 30's, but if you want the 10th Anniversary special with the original Tiki Birds, it's also on "Your Host Walt Disney", which DMR was giving away free at one point, but is now up to $75.
...Abandon ye all hope of Zorro Seasons 1&2, however.
