user1891: Right now I see on mtgox the lowest price as 105$ and the last price 165$ but when I want to buy by the price of 105$ I can not do so, the only option is 165$.
Is there something I understand wrongly?

user2306: Look at this chart: https://data.mtgox.com/api/0/png/24hours.png?Currency=USD The bars represent the current buying price, and the current selling price. 
Right now there's a big difference between the price that you can sell bitcoins at, and the price that you can buy bitcoins at. This is called the spread, and it occurs because people aren't sure how to value bitcoins right now.

user4143: That was the lowest price in the past day, not the market price.

1891: <p>Right now I see on mtgox the lowest price as 105$ and the last price 165$ but when I want to buy by the price of 105$ I can not do so, the only option is 165$.</p>

<p>Is there something I understand wrongly?</p>
 2306: <p>Look at this chart: <a href="https://data.mtgox.com/api/0/png/24hours.png?Currency=USD" rel="nofollow">https://data.mtgox.com/api/0/png/24hours.png?Currency=USD</a> The bars represent the current buying price, and the current selling price. </p>

<p>Right now there's a big difference between the price that you can sell bitcoins at, and the price that you can buy bitcoins at. This is called the spread, and it occurs because people aren't sure how to value bitcoins right now.</p>
 4143: <p>That was the lowest price in the past day, not the market price.</p>
