The post does read a bit like spam, which is probably what caused the problems over at PRI. But the information is genuine, and useful.
The
Book Depostiory is actually my favourite supplier of new books, and their prices include worldwide postage/shipping. The PRI is sending stuff out from Australia and shipping charges change according to destination.
For me, Volume one would cost approximately three times more if I ordered it from PRI than from the book depository.