Bundle of Holding have launched a special deal for a complete pdf set of all the Black Books for original Traveller.
https://bundleofholding.com/presents/LBB-2Over 50 books in total split into 2 bundles. Base rulebooks all the expansions, campaigns and published scenarios. Scenarios are pretty easy to convert to other game systems.
Limited offer for 2 weeks. If you have not bought a "bundle" before they are first rate products , always good quality and always licensed (no "unofficial" copies). They work on a 'sooner is better' basis in that the threshold price increases as the offer continues and more people buy in. The earliest buyers get the best deal and if you buy early any extra books added as the offer continues are automatically added to your set also.
Currently the price is $24 for all the books.