What you're looking for is an
Inflation Calculator. There are a bunch around, like the one Mike posted. They are most amusing, and handy for disproving the 'great financial value' of the old gear you bought new, or whether it's as overpriced as some claim. Looking back at original prices adds clarity, and comparing to today's similar items/cost certainly helps put things in perspective.
And it's a great way to pass some time.