Have you forgotten about Solo Mobile? They are still kicking and have released the Samsung m330.
This is a slider that weighs only 97 grams and has overall dimension of 94 x 45 x 15 mm. As for features of the m330 this comes with a 2-inch screen (resolution of 128 x 160), 0.3 megapixel VGA camera with digital zoom, 2.5mm headset jack, Bluetooth, speakerphone… plus all the standard contacts, calender, calculator etc…
This is available on a 2-year for $25 or prepaid/monthly for $100.
More here at Solo