I'm on my second Omron pedometer and really love it. I've purchased several as gifts too, all to rave reviews, for walkers and runners. I got them on Amazon
I second the Omron, I really like mine and the price is pretty good, right now, for the one I have, it is only $16.54 on Amazon - http://www.amazon.com/gp/product/B000MN94A2