You can find the silver metal value of these coins on the Coinflation.com website, which might help you get at least a general sense of what a coin or bullion dealer might offer you:

As of this writing, silver is just under $17 per Troy ounce, and based on that price, US 90% silver coins are worth about 12 times their face value as “melt value”: that is, a silver dime is worth about $1.20 and a half dollar about $6. The silver dollar has slightly more silver, relative to its denomination, so it’s worth about $13.

Note that those values are for as-minted, uncirculated coins. Figure roughly about a 5% discount from those totals for worn, circulated US 90% silver coins (so called “junk silver”, that is often sold in bags of $1,000 in face value), because these coins weigh less than, and hence contain slightly less silver than, uncirculated coins. So that would make their silver value about 11.4 times face at current silver prices.

Morever, dealers will need to make a profit, so you’ll receive only a percentage of these coins’ metal value, but hopefully it will be a high percentage. It may be worth the time to shop your coins around with at least a couple of phone calls, faxes, or emails to different dealers.

Another option is to sell the coins privately on eBay and let the members of their auction marketplace decide the value of your silver coins; it’s usually fairly efficient. Note that, together with their PayPal payment service (if your buyers use that service to pay you), eBay will take a total cut of around 6-11% on most sales, depending on the final sales price; in addition, buyers will bid slightly lower still because they will need to factor in your shipping costs. (You can probably ship all those coins for about $3, via First Class Mail, to any US address.) Just knowing what you might get from an eBay auction can also help you decide if local dealers’ offers might be fair.

Finally, most 1971 Eisenhower Dollars are made of copper-nickel and are worth just $1. However, a small number of these – those that have a small “S” mintmark below President Eisenhower’s bust, are 40% silver, and worth about $5 at current silver prices.