I use ShareBuilder. They have $4 trades if you set them up for Tuesdays instead of doing real-time trades.

But it's a trading account, not a savings account. Funds are not guaranteed. You can make money, you can lose money.

Depending how long you want to not be able to get to it, you might want to consider a CD. You can get them for periods of time ranging from 30 days to several years.

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The Answer is 42!!