Definition of a Silver Eagle
The American silver Eagle is the only silver bullion coin guaranteed authentic by the United States government.
Category
You can find silver Eagles on eBay by clicking the "Coins &Paper Money" category, followed by "Bullion," "Silver," then "American Eagle."
Searching
Sort by either "Time: Ending Soonest" or "Price + Shipping: Lowest First." The list of items ending soon will give you a chance to buy silver Eagles more quickly, while searching by lowest price will allow you to bid on the auctions in which the sellers let the buyer dictate the price, rather than the auctions in which the sellers start the bidding higher.
Buying
Bid on auctions that meet the criteria and condition of silver Eagles that you want to buy. Remember to incorporate the shipping cost into your maximum price. Look for sellers offering combined shipping deals to buy multiple Eagles for a lower price apiece.
Paying
Pay for all eBay auctions with PayPal, as buyers are protected under eBay's policies when they use PayPal.