“Magic Knight Rayearth“ is as old as ”Sailor Moon” and you can get the old boxset (used, like new) for $3.78 USD and the remastered discs for $31 USD (new) on Amazon. Similarly, each Blu-ray season of “Yu Yu Hakusho” costs no more than $30 on Amazon, a fair price.
The only anime titles I know that are unnecessarily too expensive are “Sailor Moon” and “Cardcaptor Sakura.”