There are selloff opportunities in every sector during a downturn, Jim Cramer said on his

"RealMoney" radio show Wednesday.

Among those stocks Cramer likes are

Boeing

(BA) - Get Report

and

Best Buy

(BBY) - Get Report

.

"The whole aerospace group is growing now," he said referring to Boeing. And Best Buy is a stock that has been going down for days -- even the CEO of the company was selling his stock -- but the company had a blowout quarter, Cramer said.

"Don't use a broad brush when painting a bear market," Cramer advised. "Stay focused."

The price of oil is also coming down. The amount of crude oil stored is at its highest levels in 20 years, and China is buying as much of it as the country can.

Although natural gas is much cheaper than oil, he said, the price of natural gas is going up. It's tough to gauge where the price of oil is going. It may fall from $68 to somewhere in the $50 range, Cramer said.

Cramer believes that the world will have more than enough copper, coal and iron in a few years. But, even though there is plenty of oil available now, he believes it will be in scarce supply down the road.

The oil sector is a good buy, he said, recommending two oil companies in particular,

ConocoPhillips

(COP) - Get Report

and

Chevron

(CVX) - Get Report

.

In the financial sector, Cramer said people have the chance now to buy

Goldman Sachs

(GS) - Get Report

, because its insiders are selling.

Right now, Henry Paulson, whom President Bush just chose to run the U.S. Treasury Department, will have to sell all his shares of Goldman Sachs.

"The stock is going down because of Paulson," Cramer said. "Buy small and hope it comes down so you can buy more."

To see the most recent edition of The RealMoney Radio Recap in its entirety, please click here. This recap is published every day around 3 p.m. ET.

Jim Cramer is a director and co-founder of TheStreet.com. He contributes daily market commentary for TheStreet.com's sites and serves as an adviser to the company's CEO. Outside contributing columnists for TheStreet.com and RealMoney.com, including Cramer, may, from time to time, write about stocks in which they have a position. In such cases, appropriate disclosure is made. To see his personal portfolio and find out what trades Cramer will make before he makes them, sign up for

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