Market volatility often sends many investors scrambling to the sidelines. However, it can be a big mistake to shift all of your money to cash.

So what should highly nervous investors do? One alternative is to consider bonds. A great way to invest in bonds is through exchange-traded funds (ETFs). Here's a no-brainer bond ETF to buy right now for less than $500.

You won't need anywhere close to $500 to get started with the Vanguard Long-Term Bond ETF (NYSEMKT: BLV). The ETF's price is currently less than $73.

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Source Fool.com