It is quite possible to buy gold bars online and get some good deals in the process.
The important thing is to do plenty of research and check out the various dealers and auctions.
Points to keep in mind include:
Know your dealer. Find out all you can about them. How long have they been in business? Are they contactable? Do they have a phone number, snail mail address and someone to talk to?
Does the dealer have a returns policy? That means, if you are not satisfied that the gold bar you have purchased is not what you ordered can you return it AND get your money back?
Do a comparison of the price between dealers. Don't forget to include the shipping and possible insurance costs. These can vary wildly.
With auctions online you need to do even more due diligence. How long has the seller been selling? Do they have a history (in eBay of course this is the feedback system and other auctions have similar systems also) you can check on?
What sort of returns policy do they have? Are they contactable if there is a problem. Also does the auction company have a policy about returns and dissatisfied customers? Ebay does and it is very extensive and eBay are sensitive to customers needs?
Does the gold bar come with a certificate that describes it accurately? Also is it sealed in its own container? If not, be suspicious and check all over it to ensure it has not been tampered with. Unless it is sealed in the original transparent packaging as supplied by the mint it is better to return it.
Keep an eye on the price of gold daily. For the smaller bars you can expect a substantial mark up and as the bars get larger the mark up will decrease proportionately. So if you are in a position to buy a ten ounce bar it is far better than buying ten one ounce bars.
Provided you keep the above points in mind you should have no trouble when you come to buy gold bars online and will enjoy the satisfaction of enjoying your gold bars at home!