As one of the most celebrated authors of the 20th century, Ernest Hemingway is an incredibly collectable author. His influence continues to this day, with several of his books being required reading in almost every public school in the country, gaining him new fans with each new generation. He was also an incredibly successful writer in his lifetime, meaning his books were printed in great quantities. That drives down the prices of these books to a certain extent so they may not be the best investment pieces, but they are still certainly prizes for any Hemingway lover to own. To Have and Have Not may not be Hemingway's most popular novel, but it was successful and was the only novel he published in the 1930s, making it a bit of a novelty for that fact alone.
The most valuable and commonly collected copy of To Have and Have Not is a first edition. These were published in 1937 by Charles Scribner's Sons, with 10,000 copies printed in the first edition alone. These have a green and gilt cover, though the most collectible versions have that covered by a dust jacket in good condition. The dust jacket for the first edition is gold with the title in black and the author's name in white. Copies with a dust jacket in good condition can expect to sell for at least $1,000, while those without the jacket might sell for a few hundred dollars, depending upon condition.
It is worth noting that the first printing of this novel in London is also a collectible, though usually only worth a few hundred dollars at most. Signed copies of the American first edition are extremely rare, and as such it is difficult to pinpoint a potential price; the few sold in recent years did so in private auctions with no published results.
Hemingway, Ernest. To Have and Have Not. Jonathan Cape: London (1937). First U.K. Edition
Hemingway, Ernest. Imet i Neimet (To Have and Have Not). Goslitizdat: Moscow (1938). First Russian Edition; Translated by Evgenia Kalashnikova
Hemingway, Ernest. En Avoir Ou Pas (To Have and Have Not). Gallimard: Paris (1945). First French Edition; 1000 copies