Clarification Does The Mint Marks On The 2000 Sacagawea Dollar Coins Increase Value?

Actually every single minted Sacagawea dollar either has a P or a D mintmark. The S mints are proofs for collectors. The only time these Sacs are usually worth much is if they are in high grade mint state, or if you happen to have one of the scarce errors/varieties.

Be forewarned though, there are unfortunately too many people selling coins on ebay and elsewhere that have no idea what they are doing, and can end up trying to sell an average circulated Sac dollar (and a myriad of other coins) for huge dollars. Asking us here is one of the best ways to learn stuff like this. Checking ebay sold prices for Sac dollars could be a very good way to get a good feel of the current market.

Just did a quick ebay search and of the first 50 results for 2000 dollar coin, only 6 were accurately priced. Clueless non-Collecters were asking ridiculous amounts for circulated examples, from $25 to $2000. Unless it's one of the rare Cheerios dollars ( none of these were) a circulated 2000 example is worth just face value.