Instapaper Pro is now on sale for $4.99 in celebration of the amazing iPhone 3G S, the new $99 3G, and iPhone OS 3.0, all of which improve the experience for developers and users and will significantly expand the iPhone’s installed base.

To clear up a common question: Instapaper Pro 1.3 owners will get the 2.0 upgrade at no additional charge. Developers currently have no way to charge for iPhone-app updates, but even if we did, I’d still make 2.0 a free upgrade once Apple approves it. (And on the approval front, I’m sorry, but I haven’t heard anything yet.)

The sale price is now less than most good sandwiches. And even the best sandwich only provides a few minutes of enjoyment. What are you waiting for?

via Instapaper Blog

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If you havent purchased Instapaper Pro yet you should. Marco just released Folders and the ability to subscribe to other people’s starred reading list.

Im looking forward to Instapaper 2.0 being released.

Thanks Marco for building a great service.