Not the first time this has happened though... first bought the entire series of "Soap" on VHS in the early 1990's on VHS... 23 tapes, mailed once a month, for $19.95 each. Later, got the series on DVD a LOT cheaper, although for some reason some of the episodes on the DVD are syndicated versions, and the tapes have the uncut broadcast versions.
When I bought the entire series set of "The Prisoner" on Blu-ray a couple years ago, paid $69.99 for it at Best Buy. Saw it on Amazon a few days ago for $33.99.
Currently have seasons 1-3 of "The Twilight Zone" on Blu-ray ordered from Amazon, expecting them sometime tomorrow. Getting season 1 for $51.99, season 2 for $48.99, and season 3 for $46.99 (going to be considered an "early birthday gift" from my mother). Hopefully, I won't go online tomorrow and see them $20 a season... since they each have a $99.99 list price!