1925 Peace dollars, like those struck in 1924, were only made at the Philadelphia and San Francisco mints. The 1925 also had a similar mintage to the coins of 1924, with 10,198,000 pieces struck at the Philadelphia mint and 1,610,000 produced at the San Francisco mint.
Many numismatists would regard the 1925-S Peace dollar as a semi-key coin, and in most respects it is, given its relatively low mintage and degree of difficulty when it comes to locating a nice specimen of the coin. Date and mintmark collectors will travel far and wide to find a 1925-S Peace dollar in nice condition, and therefore, you should make sure you take your time when buying one for your collection, as well-preserved pieces always fare better in the values department than “problem” coins.
1925 Peace dollars made in Philadelphia are far less difficult to find in decent condition. The key, really, is to avoid cleaned or damaged specimens, as many have suffered at the hands of those who want to “improve” the appearance of their coins with baking soda or another common (and often abrasive) cleaning agent.
In the case of either the 1925 or 1925-S Peace dollars, you won’t need to spend more than about $30 for an example in the lower circulated grades (when silver spot prices are about $20), but do expect to spend a handsome sum to purchase the 1925-S in Mint State-60, where prices hover at around $100; in the uncirculated grades, a 1925 silver dollar from Philadelphia will be much friendlier to your pocketbook, at around $30 to $40.