That depends on the features, lens diameter and zoom that you want. More powerful binoculars are more expensive. Also quality of optics makes a great difference to how clear and sharp your image is. Better optics naturally costs more. Binoculars prices start at about 70 dollars and go up to several thousands. You can get a good medium price binoculars by Cannon or Nikon for a couple hundred dollars. Top of the line binoculars by Bushnell or Swarovski are much more expensive.
Pocket binoculars are an inexpensive option, and a must have for travelers. Keep them with you all the time and you will see so much more, than you would without binoculars.
Night vision binoculars are the most expensive of all binoculars. Expect to pay at least 500 dollars for these. The price greatly depends on the Gen (generation) of night vision binoculars. Gen 1 is affordable, when gen 2 and 3 are very pricey.
Find the best hunting binoculars under $200 and $100