A quick trawl for the book shows it’s all but unobtainable for less than silly money for the 1st edition.
When I was looking for it a few years back I paid about £14 for the 1968 edition thinking that £68 I think it was for the 1st edition was a bit steep. Seems like I should have bought it as it sells for about 30 times more than that now, if you were silly enough.
Hard to believe it’s the film that’s caused this inflation.