PlayStation 3 Wireless Keypad for $43.96 shipped.  Here is a screenshot for your reference.  Alternatively, it is available here for the same price.  This wireless keypad for PS3 turns the regular PS3 controller into a texting device with mouse input capabilities and attaches to any DualShock 3 or SixAxis wireless controller with a QWERTY keypad and a touchpad mouse.  Most places have this PlayStation 3 Wireless Keypad for about $49.