I'm not sure if it's ever happened but Instapaper is currently free in the App Store.

Instapaper is the simplest way to save and store articles for reading: offline, on-the-go, anytime, anywhere, perfectly formatted.

On a recent episode of The Intellectual Radio Program, Adam, Tim and I debated Instapaper vs Pocket (which is always free). I still stand by Instapaper as my go to read it later app of choice, and especially now that it's on sale for the low price of free.

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Instapaper Currently Free