Wondering what that old book is worth?
It's free and easy to use and let's you see what that item is selling for on Amazon, eBay, and bookshops all over the place.
A Giles Annual #2 is in good nick, and worth well over £100.
An older "Strube" annual is valued at over £60.
My beloved "Second Century of Detective Stories" and Eagle Annual #1 held pleasant surprises too.