To quote a former editor at a Q&A about the future of Dungeons & Dragons novels. Wotc was told in no uncertain terms by hasbro "you are not a novel writing company. Quit trying to be one."
Why no RPGA adventures from the previous list?
In His Majesty's Spacial Service (1991)
Adrift (Spelljammer Masters, Winter Fantasy 1993)
Beholder Wars (1991 AD&D Open)
Adrift in Wildspace (1994)
Down and Out in Drydock (1992)
All of these, as well as more I am sure, were once available to...
Additional RPGA Adventure The End of the Matter (AD&D 1993 Year of Adventures; Originally 1993 AD&D Open) By Tom Prusa currently selling here The End of the Matter (AD&D 1999 Year of Adventures; Originally 1993 AD&D Open) | eBay
A few more known old RPGA adventures, some of them mentioned in Café de Nuit - View topic - Living Death and RPGA general convention modules..
Curse of the Casket
Scream in the New Year
The Haunted House on Haver’s Hillock
A Chilling Experience
In the Flesh
Sarcophagyn
Shadows of Vanity
Ship...