Traveller RPG Ultimate GDW Collection Bundle from Fanatical has several tiers.

$1 Tier

MegaTraveller Player's Manual [OWN]
MT Referee's Manual [OWN]
MT Imperial Encyclopedia [OWN]
MT Rebellion Sourcebook [OWN]

$10 Tier adds

MT COACC: Close Orbit and Airspace Control Command [OWN]
MT Fighting Ships of the Shattered Imperium [OWN]
MT Knightfall [OWN]
MT Hard Times [OWN]
MT Assignment: Vigilante [OWN]
MT Astrogator's Guide to the Diaspora Sector [OWN]
MT Arrival Vengeance [OWN]
MT Journal #3, #4
MT Robots (Mongoose eBook)

When Empires Fall (4-page overview of TNE)
Traveller: The New Era [OWN]
TNE Survival Margin [OWN]
TNE Referee's Screen [OWN]
TNE Players' Forms [OWN]
TNE Vampire Fleets [OWN]
TNE Fire, Fusion, & Steel [OWN]
TNE Smash & Grab [OWN]
TNE 1248 Starships 1: Small Merchant Ships (Mongoose eBook) [OWN]

TNE 1248 line of books was from a publisher that is now defunct but the rights went back to Marc Miller and now Mongoose owns all Traveller rights.

$20 Tier adds

TNE The Regency Sourcebook [OWN]
TNE World Tamer's Handbook [OWN]
TNE Aliens of the Rim [OWN]
TNE Star Vikings [OWN]
TNE Brilliant Lances: Traveller Starship Combat [OWN]
TNE Reformation Coalition Equipment Guide [OWN]
TNE Path of Tears [OWN]
TNE Battle Rider [OWN]
TNE The Guilded Lilly [OWN]
TNE Regency Combat Vehicle Guide [OWN]
TNE Striker II [OWN]

Traveller: Early Fallen (Mongoose) [OWN]
TNE 1248 Starships 2: Scout Ships [OWN]
TNE Guilded Lilly 2: Belly of the Beast (Mongoose) [OWN]
TNE Guilded Lilly 3: Into the Darkness (Mongoose) [OWN]
TNE Operation Dominoes 1: Moonshadow (Mongoose) [OWN]
TNE Operation Dominoes 2: The Minds of Idsur (Mongoose) [OWN]
TNE Operation Dominoes 3: The Isdur Gambit (Mongoose) [OWN]
TNE 1248 Sourcebook 1: Out of the Darkness (Mongoose) [OWN]
TNE 1248 Sourcebook 2: Bearers of the Flame (Mongoose) [OWN]
TNE 1248 Sourcebook 3: The Spinward States (Mongoose) [OWN]
TNE 1248 Sourcebook 4: The Freedom League (Mongoose) [OWN]

Traveller 4E: Marc Miller's Traveller [OWN]
T4 Fire, Fusion & Steel [OWN]
T4 Traveller Game Screen [OWN]
T4 Milleu 0 Campaign [OWN]
T4 Pocket Empires [OWN]
T4 Aliens v1 [OWN]
T4 Aliens Archive [OWN]
T4 Psionic Institutes [OWN]
T4 Starships [OWN]
T4 Missions of State [OWN]
T4 Anomalies [OWN]
T4 Long Way Home [OWN]
T4 Gateway! [OWN]
T4 Annililik Run [OWN]
T4 Naval Architect's Manual [OWN]
T4 Emperor's Arsenal [OWN]
T4 Emperor's Vehicles [OWN]
T4 First Survey [OWN]
T4 Imperial Squadrons [OWN]
T4 Central Supply Catalog [OWN]

$33 Tier adds

Traveller Classic RPG Collection - A previous bundle of all GDW Traveller 1E and 2E.

Now that I look through it I already own almost everything already via Far Future Enterprise CD-ROMS. So this is a skip for me.