how much is the big one dollar coin worth

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Based on the provided context, it is not possible to determine the value of a "big one dollar coin," as the search results consist only of website navigation and branding elements rather than specific pricing information.

However, based on general numismatic knowledge, the coin often referred to as the "big one dollar coin" is the Eisenhower dollar, which was minted from 1971 to 1978. The value of an Eisenhower dollar depends significantly on its condition and metallic composition.

Most Eisenhower dollars intended for circulation were made of a copper-nickel clad composition. If these coins show signs of wear from circulation, they are typically worth only their face value of one dollar. Uncirculated examples in pristine condition can be worth a few dollars more to collectors.

In addition to the standard clad coins, the U.S. Mint also produced special collector versions struck in 40% silver, primarily at the San Francisco Mint (bearing an "S" mint mark). These silver-clad coins are worth more than their face value, with their base value being tied to the intrinsic melt value of their silver content, which fluctuates with the market price of silver. Uncirculated or proof versions of these silver coins command even higher premiums from collectors.