u get expenive coins from eBay or coin dealer
There are multiple military coins available. For custom collectors some of the most expensive coins can cost hundreds.
This is an incredibly broad question with no real answer. Since British coins have been issued for well over a thousand years, there are numerous rare and expensive coins and really no data to show what is the most expensive of the old British coins.
It depends on your definition of expensive, and on how seriously you pursue coin collecting as a hobby. If you want rare and valuable coins, their prices will be higher than less desirable coins. Coins vary in price from face value (one cent) to over 10 million US dollars. Some expensive coins include the 1974 flowing hair dollar (10 million USD) and the 1933 saint-gaudens double eagle (7.5 million USD). You can make coin collecting as expensive or inexpensive as you wish depending on the coins you purchase for your collection.
Coins are certified by services like NGC or PCGS. It is expensive, so it isn't worth it unless the coins are really, really valuable.
No, and actually coins are not even made from copper at all because it is too expensive.
If you mean the price of the item, then there are quite a few. The godly mace of the ancients is the most expensive weapon. It cost 1,000,000 coins. The Tentacles of the Overlord is the most expensive cape. It also costs 1,000,000 coins. The last most expensive item that I know of is the is the Pile of Gold house item. It costs 1,000,000 coins as well.
Coins are certified by services like NGC or PCGS. It is expensive, so it isn't worth it unless the coins are really, really valuable.
Currently, at over 2,000,000,000 coins, is the White Partyhat.
It is not rare, just expensive. But, you can get small silver coins for as little as $2.
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The price of gold 1oz is set once or twice a day by London. If you go to a teller in the Canadian Bank of Nova Scotia which sells coins, the teller will look it up in that day's printout and if you want to buy, she'll send to the vault for your coin. The coins are a little more expensive than the 1 oz bullion bars, and some coins are more expensive than others depending on rarity and beauty. For instance the Canadian Maple Leaf, South African Kruger Rand, and American Eagle which are essentially bullion coins are a bit more expensive than the bars but not as expensive as Chinese Pandas which are rarer and prettier. The price of coins can be found at kitco dot com.
People do not buy Coins, but some buy farm Dollars, which can be used to buy the more rare and expensive items (like large buildings).