These tend to go for £20+ on eBay these days, so worth flagging up this copy of the Quadrophenia paperback by Alan Fletcher, which has no bids and is stuck on its starting price of £5.
The book is long out of print (and is unlikely to ever get a reprint), which means the copies in circulation tends to hold their value. The problem with this one is perhaps condition, with the seller saying it is ‘a bit too tanned to pass as Good but reasonable’. So more a reader than a collector’s version.
But if you just want to read or own the paperback version of the Quadrophenia tale, then it might be worth a punt. As I said, just £5 right now.