Most of these jacks can be re-secured without replacing. They just don't flow enough solder through the joints on the board so they break off the board pretty cleanly. If folks would put their kindles away while charging them it would help a lot (also, if they wouldn't try to plug in the cables upside down it would help too :-) I usually can save and re-use the original jack at least 75% of the time that I repair these.
Just search on ebay for kindle fire usb charge port and you'll find many $15 or less replacement jacks if you need one to repair your own and you're comfortable with tiny solder work. These aren't your HAM radio kind of solder repairs though, closer to jewelry soldering, so judge your skills fairly.