The NFB, National Federation of the Blind, has a great program through which people who use white canes for mobility can actually get one free of charge. If you're not familiar with white canes, these are special canes used by people who are visually impaired or blind may use a white cane to help them navigate their environment. They come in different lengths and typically require the user to be trained in how to effectively use one.
The NFB has a free white cane program that can get qualified cane users a free cane. This is great if you have to purchase your own and can't afford it. You can get info on the program at http://www.nfb.org/free-cane-program. You can find links to the program application as well as an FAQ on the program there.
If you would like more info on using a white cane, the NFB has a nice article going over that at http://www.nfb.org/Images/nfb/Publications/fr/fr15/Issue1/f1501tc2.html.
As always, pass along this valuable resource to people you may know even if you don't need this yourself.