how much were cassettes in the 80s and 90s? did they get cheaper as the 90s went on?

how much were blank cassettes in the 80s and 90s? did they get cheaper as the 90s went on? or the opposite?

for example, how much was a-

Sony UR in 1993
TDK SA-90 in 1991
Fuji Z in 1996

Thanks!!