I would do a search on eBay.com and see what similar coins have sold for. There are coin price guides available as well. Barns and Nobel is a great store to find all types of price guides for most every aspect of collectibles.
If you're referring to the modern presidential dollar coins, they're worth one dollar.
Double check that date or denomination. There were no dollar coins released that year.
All so-called "golden" $1 coins (both Sacagawea and Presidential Portraits) are standard circulation coins worth one dollar. They do not contain any gold and are not rare.
No dollar coins were minted in 1930. Check your coin more carefully.
Eisenhower was only on dollar coins made from 1971-78. Check to see if you have the correct denomination.
All of the business strikes of presidential dollar coins and other modern one dollar coins are worth face value only. Uncirculated ones retail for $3 to $6 depending on date.
All circulation-strike "golden" dollar coins are actually made of brass and are only worth face value - one buck. If you have an uncirculated or proof one it might retail for 3 or 4 dollars.
They are bullion coins and are worth only what the metals they are composed of are worth.
The Great Law of Peace Sacagawea golden dollar coin is worth its face value of $1. However, it may have some additional value to collectors depending on its condition, rarity, and demand. It's recommended to have it appraised by a reputable coin dealer to determine its exact value.
The U.S. did not make any dollar coins between 1936 and 1970 inclusive. Please check again and post a new question.
A William Henry Harrison "Golden" presidential dollar is worth about a dollar unless it's slabbed by PCGS or NGC at a very high rating (e.g., MS69 or MS70), or is Proof. A full roll of dollar coins includes 25 coins, not 12.
Presidential dollars were first issued in 2007. You have a Sacajawea dollar. The golden color on the outside isn't gold. So it's only worth a dollar. If it was plated in real gold it's still only worth a dollar. Gold plating adds no value to coins. In fact it actually decreases the value in some.