I also draw with ball point pens and don't burn through paper. When you know your deal and your tools, mistakes don't happen often, and if they do they're small and you can easily fix or incorporate them into the picture (when it comes to ball points)
I was using a mechanical pencil the other day, and I'm seriously thinking about switching to them. I don't really like them too much, but I also don't like searching for sharpeners. On the plus side, it worked really well for animation pencil tests.
The only pencils i use are my .3 mechanical pencils, it's the only thing i really have for pencils though at the moment. I would still use no. 2 pencils if they were present just for the sake of actually shading. I like to use pens to, just pen. It helps me not to depend on erasing so much so i can learn to work with my mistakes.
I got most of mine from my local art store, a group of us decided to continually ask if they had any and then they finally started selling them. I think you can get them at hobby lobby if you have one near by. The internet is always a good place to. My latest .3 i bought is when i was in Japan, i bought it cause i didn't pack any of my art stuff with me when i went and i wanted to doodle when i was on the Shinkansen.
I draw lineart, mostly. Since I got my tablet I've been Doing more color work, and I'm running out of lineart I'm interested in coloring. So I need to draw more, but all of my pencils suck or drawing details.
My tablet just broke a few days ago, i guess its all right though cause it reminded me that i have other art that i can work, on such as sculpting and painting. I just made a ditto transforming into a gyarados!
Why not just work on different styles of art with other medias until you can find or get yourself a new mechanical pencil? You might find a new style that you would enjoy.