For a Harry Potter fanfic I need to know roughly how much magnesium ribbon cost in Britain circa 1996-7. This isn't even slightly vital but I like to be accurate - if someone has a reference such as an old catalogue I'd be grateful for the information. Prices for another country might be enough, I only need a ballpark figure. I can write around it easily so please don't go to a lot of trouble.
I've tried web searches for catalogues around this date from various educational chemical companies I dealt with in this period and got no results at all, there appears to be nothing on line.
Update - Since posting this for moderation I've written around it, but it would still be useful to find a source for scientific pricing in the era for future reference; I actually worked as a technician at the time but threw away old catalogues since I had no room to store them, and have a lousy memory - I had no idea that 20+ years later the info would be useful.