2013 annual was a special 75th birthday.
The annuals continued to be published after the comic ceased to be!
One half of 'The Big Two' with The Beano Book. Dandy Books still sell well though are traditionally below Beano values. The first one was titled The Dandy Monster Comic and the cover shows Korky the Cat in the foreground pointing to other characters each named, Jimmy/Grockle in right bottom corner.
This annual does occasionally show up on eBay UK and at auction in lower grades but rare in anything beyond Fine. The highest graded known copy of the first annual in Very Fine Plus was sold at auction in September 2006 for £6,232.
And low grade first annuals are popular too. A Poor copy with no spine and detached front board sold for £418 in Sep 2006 by Comic Book Postal Auctions.
Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.