If I can remember correctly, the original book cost $100. I was able to get the 1880-1989 version on eBay last year for $30! I would expect this updated version would be more than the original book, but not what we're seeing on Amazon. I think $200 is reasonable.The prices are high on the original because it's a collector's item and hard to find. Hopefully the updated version won't be as expensive, but due to the sheer size of the books I'd expect the price to be north of $200 for the set.
Nancy,I just looked it up in bookfinder.com. Whoa. I don't sell books, but I read somewhere to ignore the 3 lowest & highest priced, then go for the middle. Taking condition into consideration. Of course, you never know how much these books actually sold for, but still, all are over $245.
Try looking at ebay, show only completed items. May be more realistic, but the prices are still good. Note that in my experience, ebay is where the best bargains are, so they are priced a bit low? I didn't check ISBN's on ebay so some might not be identical to yours.