I've got several of Ian Skennertonicon's smaller books that I've picked up 2nd hand when I've seen them at a reasonable/good price. I didn't suddenly wake up one day and think to myself "Today I must buy some of Ian Skennerton's books.". But if I have seen something by him offered at a reasonable price 2nd hand and have thought that it may be of interest I may buy it.

If you want a specific one of his books that is still being published but don't want to pay the current retail price, it's a case of finding a 2nd hand copy.