I may be posting this question in the wrong area: if so, I apologize for my mistake and ask the moderators to move this to the appropriate section. I need to know what average prices were for the following roll and sheet films during the times indicated in parentheses. If you can quote prices from a reliable source (e.g. an old magazine from the periods specified) please let me know:

PX135-20 and 36 (1980-1984)
FX135-20 and 36 (1980-1984)
TX135-20 and 36 (1980-1984)
HIE136-20 and 36 (1980-1984)
AgfaPan 25 and 100 in 4x5 (1984 to ~ 1996)

Any help would be much appreciated. Thanks.

N. Riley
http://normanrileyphotography.com