$1,400 to buy it in book form. That may be part of the reason it's not being printed anymore.
The quick way to find out is - if they could make a good profit selling the entire set for $x where $x < $current, would they still be doing it? The answer is yes.
The reason the price used to work and doesn't now is that digital equivilents are not only (subjectively) better/easier/etc. - they're also cheaper.