Sleuthing at eBay in completed auctions reveals the following high end series book sales:
NANCY DREW:
The Whispering Statue #14 first printing=$247.50
Whole set 1-56 picture covers and cookbook=$227.71
Unused lunchbox/tag=$178.27
117 Nancy Drew paperbacks=$167.50
1957 Game=$142.99
Whole set of all 13 computer games=$94.00
The Clue in the Jewel Box in DJ signed by Mildred Wirt Benson=$82.99
Files Cover Art Painting #47 Flirting with Danger=$67.76
The Mystery at the Ski Jump Cameo=$61.09
The Mystery of the Tolling Bell 1946 Blue 1930s silhouette cover format, book only,=$59.00
OTHER SERIES:
Rick Brant Danger Below pc #23=$499.99
32 Tom Swift yellow pcs=$350.00
Three Investigators HC Sinister Scarecrow=$349.44
Hardy Boys A Figure in Hiding w/ DJ=$201.38
15 set Deluxe Trixie Belden books=$164.00
Tom Swift Galaxy Ghosts #33=$152.50
The Mystery of Jockey Hollow by Cleo F. Garis (Arden Blake Mystery series) w/ dj=$128.99
Happy Hollisters Midnight Trolls w/ dj=$103.84
Trixie Belden The Mystery of the Galloping Ghost=$63.77
1957 Bobbsey Twins Game=$62.00
Hardy Boys Lunch Box=$58.00
Hardy Boys Dolls=$56.00
Cherry Ames Game=$56.00
Hardy Boys Detective Handbook w/ dj=$26.52
Hardy Boys Treasure Game=$14.50