Hey there, Lukas. =D
Yeah, there are long-point pencil sharpeners you can buy: http://www.dickblick.com/products/kum-long-point-pencil-sharpener/
You could also sharpen the pencil with a knife and shape it the way you want it, and save some money.
Something you could also look into is a clutch drawing pencil. If you haven't heard of them before, it's like a mechanical pencil, but they come in thicker graphite-stick sizes than the average mechanical writing pencils, and with that, you can adjust the lead to the length you want.
I hope that helps a bit. =]