Largest Stamp Price Increase In Postal Service History Goes Into Effect Sunday

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PHILADELPHIA (CBS) -- Sending letters and packages through the post office just got a bit more pricey. On Sunday, the cost of forever stamps increased by five cents to 55 cents.

The hike is the largest in U.S. Postal Service history.

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Priority mail prices also jumped.

A small box, which previously cost $7.20 to ship will now cost you $7.90.