Get thee to a used book shop, or to used-book sites on the web. Verne wrote a lot of stuff, and most of it has been translated into english at some point and published in hardcover. But most of it isn’t in print now.
Also, be advised that a lot of older translations of Verne (especially those pre-1960) are awful, and can omit up to one thirs of the book! Those done since 1960 tend to be more complete and accurate. Avoid translatioon by Lewis Mercier/Louis Mercier/Mercier Lewis.
My favorites:
Twenty Thousand Leagues Under the Sea. Get the annotated edition, if you can find it. The guy who annotated it later did his own translation. The sequel, also worth reading, is The Mysterious Island
The Weapon of Destruction – Verne’s other, lesser-know submarine book, although it has been adapted itself for the screen, and inspired a big chunk of the Disney movie.
From the Earth to the Moon Again, get the Annotated Edition if you can find it. There are two sequels – Around the Moon and The Sale of the North Pole
** A Journey to the Center of the Earth** – the translation published by Penguin is pretty good.
Around the World in 80 Days – nice twist at the end.
Michael Strogoff, Courier to the Czar – also has a cute twist
The Fur Country – Canadians trying to find the Northwest Passage. Cute twist in the middle.
Tribulations of a Chinaman – How many Frenchmen were writing novels with Chinese heroes in the 19th century? Our hero uses a rubber survival suit to survive a shipwreck!
Robur the Conqueror and Master of the World – a lot better than the Vincent Price movie they made out of it.
The Hunt for the Meteor – Jules Verne invents the Tractor Beam!
There are a lot of others. Ace books published quite a few in paperback in the 1960s. There was a company that published almost all the Verbe ouevre in hardcover about the same time, and a lot of big city libraries still have them.
H.G. Wells is underappreciated. As an sf fan friend of mine pointed out, most people miss what his novels are really about.
The Time Machine – shorter than you expect, but good
The Invisible Man
The Food of the Gods – made into three different bad movies! Ignore them, read the book. Wells was in a unique position to invent the “Giant Creature Destroying the City” icon, but he didn’t. Deliberately, I think. Wells asks – “How does the presence of giant rats and beetles change everyday life?”, not “How Sensational can I make this description of mass destruction?” Wells was a social critic, not Bert I. Gordon.
The Island of Doctor Moreau – ignore all film versions. Especially Brando’s.
Star Begotten – not great, but an impressive premise – aliens cause mutations in Earth babies by Cosmic Rays (!)
And look for his sghort stories. Many of them are wonderful. Two films based on his books are especially worth looking up – The Man Who Could Work Miracles and Things to Come