CrazyOnDigital Kindle 3G 3rd Generation Leather Case is a nice leather case that costs only $11.99. It is sturdy and stylish.
It comes with a screen protector, but I wouldn't use it. I recommend to use a more expensive anti-glare screen protector, not a clear screen protector that comes with this leather case.
CrazyOnDigital Kindle 3G 3rd Generation Accessory Kit includes Leather Case + screen protector + Auto Car Charger + AC Home Wall Charger + Sync and charger USB data cable + headphone. It costs only $16.99.