Here's a lsit of Signed/Exclusive Books available NOW. Most are signed, but some are editions made specifically for independent bookshops, definitely not available on Amazon, and often not available at WH Smith or Waterstones.   Use the filters to identify the exclusives.  There are limited numbers of them so get them while you can!  If the book below says Book Plates it means the author has signed a label which has been affixed to the title page.