The entire series is available on dvd for a reasonable price at http://www.ideachannel.com/shop/shopftc.htm. The discussions were updated in 1990. The shorter 1990 set is also available at the same url.
I've watched these many times, and I recommend them highly.
I'd like to watch them; I just don't have the cash to spare for the series.
I also highly recommend "The Commanding Heights" series by Daniel Yergin, which can still be viewed on PBS' website, I think.