A few years ago, when the number of Discworld books were below 20 and I was scouring used book stores for some of the early books, I bought only paperback. Since then, I have a few hard covers, but I still usually wait for the paperbacks, despite their awful covers. If I had the money, I could scrap all those books and get the collector’s library. Each volume is only 10 quid, which means they’ll be devilishly hard to get in the US.