Amazon.com Inc. is dropping the price on its Kindle e-reader, but the change comes with a trade-off: On-screen ads, reports the Associated Press. The online retailer was set to announce Tuesday that the new Kindle with Special Offers will cost $114–$25 less than the currently lowest-priced Kindle–and include advertisements on the bottom of the device’s home page and on its screen savers. Seattle-based Amazon will start shipping the newest Kindle on May 3, and it will also be sold in Target and Best Buy stores on that date…