Just posting this now, but coming up next month will be the 30th Anniversary Of The Nancy Drew & Hardy Boys SuperMystery'88 series. June 1988 was when Double Crossing first appeared, with A Crime For Christmas being released in November 1988.
Yay for 30 years of Nancy Drew & Hardy Boys Supermystery series! I LOVE this book series! It is one of my favourites to read! :) 8)
I haven't even read them all yet. :( Wish there was a way I could.
Check your local used book stores and thrift stores and Amazon.com and Ebay.com, etc. They can still be found fairly readily.