(CNN) - If you have an old iPad you want to get rid of, you'd better sell it soon.
Apple has an event Tuesday that will likely debut a new iPad and that's causing the selling price of the old iPad to fall fast.
Companies like Gazelle and NextWorth that buy electronic devices said they've seen a surge in sales that started when the Apple announced the event last week.
Last year, trade-in values for the iPad dropped four percent when Apple announced its latest generation iPad in October.
When the tablet hit store shelves in November, that trade-in price fell by another 10 percent.
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