There are a few different "main designs" of Greek Helmets that the Greek wore (or their close related factions) that are worth mentioning or that most people are looking to add to their collection. These include the Trojan helmet, Corinthian helmet, Spartan helmet, and Hoplite helmet. Most of these can be found in online stores, but you may want to do some research as to which are historically accurate before buying.
What do you think of when someone says "Greek Helmet"? The first thing that pops into your head is a picture of a Spartan soldier, complete with a red cape, round, bronze shield, long spear, and a bronze or brass helmet with the ever-so popular plume. Fortunately, stores have recognized this fact and this type of helmet is widely carried online and in brick-and-mortar stores. Commonly names as the Italic Corinthian helmet or just plainly a Spartan helmet, this replica will be a great addition to your collection. What you'll most likely see are three types of helmets: a brass helmet with tan or red plume, a black helmet with a tan plume, or a silver (plain metal) helmet with a tan plume.
The Greek city states which included Sparta had a very unique culture. This included recognizable soldiers. Their armor, weapons, and helmets are still admired and sought after by collectors, reenactors, stage plays, and historical enthusiasts. Discussed below are some of the most popular helmet types that are most widely available today in online retail stores.
Another popular Greek helmet is the Hoplite helmet. The Hoplite was a common soldier for the Greek armor and they carried the recognizable white round shield and a long spear. They were excellent for repelling cavalry and charges by soldiers. However, being not very maneuverable, they were vulnerable to attacks in the rear. The hoplite helmet usually has a tan or whitish color plume. Often times it was made into a braided pony tail at the end of the plume.
The main thing to remember when looking at Greek helmets is that many of them look very similar. This is most likely a good thing when you are doing your historical research or are looking for a helmet to purchase. Even if you accidently buy a helmet that is not quite historically accurate, your helmet will look similar enough to the others that the general populace will not know the difference.
The hoplite helm is available today at many online stores. It is a standard silver, made out of metal, and has a long tan plume. There were many other types of specific Greek helmets, but these are the most common and basic used by the ancient armies. Some of the best replicas Greek helmets made today are hand-made by a Indian manufacturer called Al-Hamdd Trading Post. Armor Venue and Armadillo Armory are the major importers of their products.