Gold Bars are a great way to invest in gold. The primary advantage of gold bars are their relatively low mark-up price compared to the spot price of gold. In other words, it is generally cheaper to buy a 1 ounce bar of gold, than a 1 ounce gold coin. Gold bars are a "no-frills" way to invest in gold. You generally aren't buying these bars because they are pretty or collectable, you are only interested in the gold's metal value.
When you sell a gold bar, you generally receive less money than you would for a gold coin, but when you factor the cost you bought the bar for, you often save money anyway. Popular gold coins like the US Gold Buffalo have a high mark-up value, but when you sell the coin you might only get the current spot price of gold anyway - or less. If you plan to sell your gold in the near future (meaning anything from 1 week to 4 years), gold bars are a smart, conservative choice.
Another advantage to buying gold bars are their varied sizes. Popular sizes are 1 ounce (really a "troy" ounce) and 1 gram. The 1 gram bar is affordable for just about any potential gold investor. Other popular sizes are 5 gram, 10 oz, 100 gram, 10 gram, 20 gram and even 1 kilo! Popular "brands" of gold bars are Credit Suisse, Pamp Suisse, Perth Mint, Heraeus, Johnson Matthey, Engelhard and Sunshine Mint.
Above are the spot prices of popular gold bar sizes. To find gold bars close to spot price click the picture under the price. Under those deals we've highlighted the popular mints.