Gold coins typically sell for a premium over spot bullion, but again the prices are "set" by traders as they actively trade. When lots of people want Eagles, Kruggerands, etc, and supplies are tight, the premiums over spot bullion can increase sharply. Again, it’s like trading other commodities. When the world is short of wheat and people want to eat, the price can jump quite sharply. When there is a bumper crop, prices drop.
References :

Occasionally, however, in some listings of coins for sale, some Philadelphia Mint coins may nontheless be designated with "P" or "-P" following their dates, to fully identify these coins as originating at the Philadelphia Mint, and thus resolve any possible ambiguity.

Coins have value based on their value to collectors, and in some cases, on their metal content (e.g. for silver coins that might otherwise have little collectable value). Some Philadelphia mint coins are scarce and valuable, while others are common and have little value; it just depends on the denomination, series, and date of the coin, and its current value to collectors.

You can find many coin value guides on the Internet. Some of these include:

http://values.hobbizine.com/coin-index.html
(Retail prices, but fairly realistic)

http://coins.about.com/od/coinvalues/Coin_Values_Prices_Red_Book_Price_Lists_What_Coins_are_Worth.htm
(Very realistic prices)

And for earlier coins:

http://www.pcgs.com/prices/
(Fairly high retail prices, but a good general guide nonetheless)

As for grading (condition), which is a major determinant of a coin’s value, you might start here:

http://www.coin-gallery.com/cggradingart.htm

There are also grading books that you can buy, or find at a library or bookstore, that offer detailed photos or line drawings that you can use to more accurately assign grades to your coins.
References :

The bottom line is this: The rich have won the class warfare game years ago, people are now working for poverty-level wages, and the powerful have CONTROL over what’s happening to this country of ours.

At the flip of a switch, they can REJECT health care reform, cures for cancer, and minimum-wage increases.

At the flip of a switch, we can go to war for false premises and rigged intel, and squander away our nation’s strength pissing away on the war on terror and never making so much as a DENT. (Like we did with the war on drugs.)

So am I surprised by what’s happening now with our country?

Nope. It’s just going to hell in a hand basket and the only thing left for our country to do is *fall* like the Roman Empire did 2,000 years ago–because it was morally decayed and corrupt just like we are right now.

And no amount of praying or complaining is going to change that.
References :

When Andrew Jackson was President he was once informed that the Supreme Court had ruled on of orders Unconstitutional he replied "They can rule what they like, let them try and enforce it", and did as he pleased, a principle Presidents have been employing ever since unless they had a strong enough Congress to stand up to them. The danger has always been there, as have been the Constitutional tools to contain it if our elected officials would but choose to use them. Power is derived from the people, but it is only retained by the people through active and informed citizens making their views known and enforcing them in the voting booth, no politician can cause problems after he’s voted out. The problem is that the U.S. has become a country where less than half the eligible voters in any election even bother so to do which makes the kind of things described in the article inevitable. In the end a people only become slaves because they choose not to fight for their freedom, that the people of the U.S. have forgotten that is why we are in decline as a power. Spain was the dominant power in the 17th century, France in the 18th, Britain in the 19th, and the U.S. in the 20th, all became complacent and lazy and were replaced, why do people think we will be any different? The Pax Romana lasted ten centuries, the Pax Americana doesn’t look good for one, kind of sad really, the ’50s were both our greatest achievement and our downfall, people became convinced the free ride would last forever.
References :

http://en.wikipedia.org/wiki/Commission_on_Presidential_Debates

http://www.lwv.org/AM/PrinterTemplate.cfm?Section=Press_Releases&CONTENTID=7777&TEMPLATE=/CM/ContentDisplay.cfm

http://www.npr.org/templates/story/story.php?storyId=4052162

http://www.sourcewatch.org/index.php?title=Commission_on_Presidential_Debates

http://www.lwv.org/AM/Template.cfm?Section=Election_2008&template=/CM/HTMLDisplay.cfm&ContentID=11965

http://www.commondreams.org/views04/0115-08.htm

http://www.canadafreepress.com/

http://freedomkeys.com/radio.htm

Sure, I’ll ride shotgun with you ANYTIME!!!

P.S… keep informing the less enlightened among us!
References :
Your reading some of em!

We seem to think that as long as we can say any disgusting thing we want to without being arrested, we still have freedom of speech. I don’t believe people see that the NWO is well underway. It is so in our faces that we are missing it. Globalization has led to world organizations making the laws and handling the money. Our sovereignty is shrinking constantly. Our policies are set by the WTO, the G8, the G20, the World Bank. Soon our criminal system will be changed to be in line with the World Court and yet people call this a ridiculous conspiracy. Its right in front of their faces and yet they deny it. Unbelievable.
References :