RealMoney Radio: Act on Ameritrade

Ameritrade (AMTD Quote) may have been knocked down because of Bank of America's (BAC Quote) new free-trading plan, but Jim Cramer told a caller on his "RealMoney" radio show Monday that he believes Ameritrade is a buy.

Although Bank of America's plan offers free trading for people who put at least $25,000 in a single account, people get less interest on their money.

"I don't think this is the death of Ameritrade, but the stock's acting like it is," he said. "That tells me people should be buying the stock. It is too cheap."

Responding to his next caller, Cramer said that Boeing (BA Quote), which has "great" management, "is killing these clowns at Airbus."

"Boeing at $82 is going higher," he said.

Cramer advised another caller to add to her position in AMN Healthcare (AHS Quote).

The stock, which is a play on the fact that we don't have enough qualified nurses in this country, is at its 52- week high and is going higher, he said.

"You should be willing to pay $32 for this stock," Cramer told the caller. AMN Healthcare was recently trading at $25.80.

When a caller inquired about Walgreen (WAG Quote), Cramer said he is not concerned about the long-term problem concerning Wal-Mart (WMT Quote) getting aggressive on the pharmacy front.

"Rite Aid (RAD Quote) is also good speculative stock," he added.

Cramer told another caller that USG (USG Quote) is "very right."

"If you imitate Warren Buffett," whom Cramer called "the greatest investor of this time" and also owns USG, Cramer said "you are going to make a lot of money."

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