There are two bundles for Advanced Fighting Fantasy RPG 2E, which is based on the Fighting Fantasy game books.

Advanced Fighting Fantasy Starter ($8)

CB7-7001 Advanced Fighting Fantasy RPG 2E (2011)
CB7-7002 Out of the Pit (2011) - monsters
CB7-7005 Heroes Companion (2012)
CB7-7007 The Sorcery Spell Book (2013) - spells

Advanced Fighting Fantasy Bonus (+$11)

CB7-7003 Titan: The Fighting Fantasy World (2011) - world setting
CB7-7004 Crown of Kings (2012) - campaign for experienced PCs
CB7-7006 Blaksand (2013) - city setting
CB7-7008 Beyond the Pit (2013) - more monsters
CB7-7009 The Warlock of Firetop Mountain (2016) - adventure based on the FF book

More Fighting Fantasy Starter ($10)

CB7-7013 The Titan Herbal (2017) - lots of herbs and plants
CB7-7015 Demons of Doom (2018) - Demon PCs
CB7-7016 Rough Guide to the Pit (2019) - sourcebook

AFA-001 The Floating Dungeon of Varrak Aslur (2018) - short adventure
AFA-002 Inn of Lost Hope (2017) - short adventure
AFA-003 Crooked King's Cup (2018) - short adventure

More Fighting Fantasy Bonus (+$11)

CB7-7018 Travels in Arion (2019) - city guidebook
CB7-7019 Return to the Pit (2019) - yet another book of monsters
CB7-7021 Combat Companion (2021) - rules supplement
CB7-7022 Citadel of Chaos (2022) - 4-act adventure based on the FF book
CB7-7023 Encyclopedia Arcana v1: Treasures (2022) - treasure creation system + treasures (there is no v2)

Other Books Not Included

CB7-7010 Advanced Fighting Fantasy Deluxe (2016) - omnibus of 7001, 7002, 7003.
CB7-7020 Creatures of Mishna (2020) - small supplement of an island

AFA-004 The Vault of the Old Kingdom (2019) - short adventure
AFA-005 The Taskmasters Tower (2019) - short adventure
AFA-009 Temple of the Ice God (2022) - short adventure

Other books in sequence but not Advanced Fighting Fantasy

CB7-7011 Stellar Adventures RPG (2017) - ruleset is derived from Advanced Fighting Fantasy
CB7-7012 Starship Catalogue (2017) - starships supplement
CB7-7014 The Kaladarian Response (2018) - adventure for Stellar Adventures RPG
CB7-7017 Weapons and Armour Catalogue (2019) - equipment

It's a nice pair of bundles that encompasses almost all 2E published materials. But only two campaigns, one adventure, three mini adventures. Kind of sourcebook heavy so probably not worth $40 to me.