I've also noticed that blank C60 cassettes seem to have gone from the major outlets, only C90s on sale in supermarkets & hi fi chains. C60s were ideal for recording 30 min or 1hr radio progs for later listening. Now if it's an hour you have to put 45 mins one one side then 15 mins with half hour blank or find something to fill it up.

RtS
(Who still has piano rolls, 78s and reel to reel tapes)