Hi,
I´ve always been a big fan of the Walther P-38 and the PPK and I´m looking at maybe starting a collection. Could anyone here give me som good tips on books etc?

the ppk is still being produced, the p38 is not. there is a great deal of potential for history and collecting if thats the route you want to go. if you're looking for a pistol to take to the range and shoot, they can be had relatively easily. local shop has a p38 in stock right now and a ppk.