Good news: now you can pick up an Amazon Kindle 3G for the same price as the Kindle WiFi. Naturally, there's a catch here: ads, ads, ads -- but you've gotten pretty good at tuning those things out anyway, right? The online retail giant announced today the availability of the Kindle 3G with Special Offers, priced at $139 (down from $189 for the ad-free version) -- best of all, that price includes the 3G subscription, which won't cost you a thing, if you're willing to wade through "money saving offers" and some adtastic screensavers. The AT&T-sponsored e-reader joins the already announced