I’ve just added some new charts to mediaprices.co.uk - that show the cost per gig in easier to understand terms, spread over a timeline. You can now see whether the item you are thinking of buying was cheaper in the past.

I’ll add some more info shortly about how best to read the graphs - but it will take a few days for them to pick up the pricing data and for them to actually mean anything. Drop me an email if you have any comments etc.