On the other hand, perhaps it might be better not to limit yourself on just gold. Last year, a seller sold this coin to me:

Doesn't look that special does it? Well that just went for around 25USD ish and I knew it's worth way too little for a Japanese coin especially in color.
And when I checked the prices online on Yahoo Japan Auctions, well what do you know? Over 550USD easily!
Another deal is a 1973 Soviet Mint set that I bought. The seller didn't care how much it would sell and listed it at 15USD including shipping. Big mistake. When I saw it, I knew it was a mad bargain and hit the BIN. Turns out that the average price is at least 100USD.
Moral of the story: Do your research before buying!
Also a good alternative is to look at this site:
http://www.pandaamerica.com Under the search function, hit "1/10" and you will be able to see a wide variety of coins minted in 1/10oz of precious metal.