Yes, check out NumisMedia.com or just type in "Free coin price guide" in your browser and see what pops up.
Try worldcoingallery.com It's free. Click on the green dollar signs to go to the price reference.
Yes, there are several free online resources where you can access price guides for old coins. Websites such as Numista, CoinTrackers, and PCGS offer information on coin values that can help you determine the worth of your collection. Remember to cross-reference prices from multiple sources for an accurate estimate.
There are hundreds, if not thousands of such sites, far too many to list here. While it's not normal WikiAnswers policy to say "use a search engine" that may be the best approach here.
Alternately, you can check a few of the sites linked below:
There are several coin price guides for US Coins (and foreign coins) the most widely used for US coins is known as the "Red Book" (its full title is A guide book of US coins) but nearly any major coin magazine such as "Coin World" and others contains a price guide. Furthermore there's several free price guides that you can find online just by searching "coin price guide" on Google. In general, the Red Book is the most accurate for retail prices, but its fairly expensive. Online price guides are wildly different in their accuracy. Magazine price guides can adapt quickly to changing tastes and values, but usually have little to no pictures to aid in identification of coins and grading.
A lot of them. But most are not free, just type in "Online Coin Price Guide" in your browser and see what pops up, one of the better free sites is NumisMedia.com
Ask a coin expert . A dealer . Or get a up to date price guide for the coins in question. 3rd party coin graders like P.C.G.S. Or N.G.C. Have a price guide on their sites . Probably the 3 and 4th suggestion is your best bet.
Take them to a coin dealer for an appraisal. It would be a good idea to borrow a price guide (the Blackbook or Guide to US Coins for US coins) from the library and try to separate the 'good stuff' from the 'junk' first.
Ebay
the rampage hulk
Yes, there are some old coins that are worth a lot of money from countries or islands that don't exist anymore. A coin dealer can check out the coins and give you a price for them.
Please see the Related Link for a price guide.
What catalog do you recommend as a price guide for old foreign stamp prices?
See the related link below for a price guide to US coins. It doesn't point out the rare coins but you can pick these out yourself. Obviously rare coins are worth much more. Coins with a much higher value than others in that category are probably rare or semi-rare.
One can find a coin price for old Argentinian pesos at your local Cash4Gold store. A dedicated agent will be happy to buy your coins in exchange for cash.
Definately Ebay. I can't stress this enough ... do your homework pertaining to your coins. Some coins are far more valuable than you may think because of rarity or a mint mark you may have missed.
There is no patron saint of old coins.
It depends on what type of coins you have. If the coins are collectible coins, that is, old, high grade, and desirable, the best place to find the value of them is in the Red Book coin guide or take it in for an estimate by a coin dealer. On the other hand, if what you have are low-grade, common coins primarily for their bullion value, I will include Coinflation which is a website that shows the precious metal content of pre-1965 US coinage and Canadian coins in the related links. You might also want to check Ebay for what people are paying for the coins you have. Keep in mind that you should never clean old coins because that destroys the value of them.