This is what I carry. Got the last one for free in fact. Lost mine on BART (I think) and went back to the Big5 where I had originally purchased it, and the salesman and I had got to talking, I guess he liked me, so he just made me pay sales tax on a new one. It was the last one they had and also the display model, so it didn't come with a box? lol.

They can be had for super cheap. I got my first one for like 35 bucks.

edit:
How bout that? Amazon prime for $25.