Tunes - Tuneflow

Firefox: Sure it's fun to hunt for deals online, but it's even better to be alerted when an item you want is at its lowest price. Ookong is an Amazon.com price comparison tool you can use to track price histories.

If you're wondering if it's worth buying something on eBay because it might be readily available and cheap on Amazon or vice versa, Q-Compare can help you comparison shop between the two services.Click on the image above for a closer look.

We've all been here: you pick out a few items from Amazon.com, you're about to finish your order, and Amazon informs you that you're a mere $3.72 away from free shipping. FillerItemFinder finds a cheap item you actually want to meet the cutoff.

Firefox only: Clicking through multiple product images while shopping on Amazon is really a chore. PictureFox, a handy Firefox add-on, opens all the images in a single gallery so you can stop making with the clicky-clicky all the time.

Last week we asked you how much you would pay for an e-book, and just shy of 10,000 votes later, it looks like most of you (70%) aren't interested in paying any more than $10 for an e-book. The basic voting breakdown, from top to bottom, looks like this:

Over the weekend, Amazon and book publisher Macmillan got in a tussle over the price of Macmillan's e-books. In short, Macmillan wanted to—and ultimately did—hike the main price for e-books from around $10 up to between $13 and $15.Naturally, it got us wondering:

Windows/Mac: doubleTwist, the gadget-friendly media manager that wants to be an iTunes replacement, has added a native Amazon MP3 store to its Windows client. That's roughly two months after it was expected, but it's a welcome option for music buying.

Amazon is running a brief promotion (ends November 30th) offering $3 worth of MP3s from Amazon MP3 for free. Just head to this page, follow the directions, and enjoy your free credit.

Windows: Amazon has released a Windows application, Kindle for PC, that tells you everything in its name. It syncs with other Kindle devices, offers color pictures, font size control, and other controls for reading on your computer.

When we asked you to share what music helps you get things done, more than a few of you answered Philip Glass. Today on Amazon, you can boost your Glass catalog for the low-low price of zilch.