Sparrow, arguably the best email client for iPhone, is on sale for a limited time. You can get Sparrow for $0.99 today and tomorrow. On Thursday, the app goes up to $1.99, then back to its original price of $2.99 on Friday. Act quickly.

If you had been holding off on Sparrow due to its relatively high (but justifiable) price and lack of push notifications, I’d say getting it for $0.99 is worth it. Even without push notifications, Sparrow blows the stock Mail app out of the water. Of course, if you’ve got a jailbroken iPhone, you can use the Sparrow+ tweak to bring push notifications to Sparrow, as well as the ability to make Sparrow your phone’s default email app.

Unfortunately, Sparrow is iPhone-only at the moment, but you can expect to see an iPad version soon. When the iPad version does hit, I hope that Sparrow will just become a universal app, rather than two separate apps. However, I could easily see that being a possibility as Sparrow is a very gesture-based app. With a larger screen, the iPad version could have its own gestures for navigation through the app. Throw some push notifications in there and you’ve got yourself a Sparrow HD.

I could be (and probably am) completely wrong about that, but we won’t know anything until Sparrow makes it official. As always, we’ll keep you posted.

For now, you can get Sparrow for $0.99 in the App Store. Do it fast! The price goes back up to $2.99 on Friday.