I thought I'd pass along this handy page I found this evening: Current Value of Old Money. It collects a large number of links that strive to answer questions like "How much would X have cost in blah-time-and-place?" and "How much would so-and-so make a year?" and "How much of something would unit-of-currency buy?" for settings as diverse as Victorian England and Imperial Rome. Though largely European and North American in focus, there also look to be a few on Asian prices. Hopefully this will prove helpful!