Unless you're extremely flexible or have a forearm that is as long as your leg, you may have some trouble reaching in certain places of your back to scratch a nagging itch. Your only other option is to ask someone to scratch it for you, but when you're alone and have an itch back there, you will get satisfaction by simply using a back scratcher. You can find a style that will best fit your needs in both online and offline stores.
Back Scratcher World
If you want a very wide selection of back scratchers to choose from, including plastic, wood, and rare styles, visit BackScratcherWorld.com. The site is neatly categorized by regular and special types of back scratchers that you might prefer. For instance, there is a scratcher that is shaped like a little hand in a golf glove. If this is a gift, this site is a practical place to search for a creative scratcher that goes with the recipient's personality rather than just a standard style.
There is a wide selection of wood, bamboo, metal and plastic back scratchers also available at Amazon.com (see "Resources" for a direct link). Most of the scratchers are very reasonably priced, and the shipping may be free if you order over a certain amount of Amazon merchandise.
Local Health Stores
You may be able to find the more therapeutic brands of back scratchers at your local health store, vitamin shop, or spa. Try greenpeople.org/healthfood.htm, VitaminShoppe.com, GNC.com or SpaFinder.com to find a location near you.
Bed Bath & Beyond
Back scratchers are most likely categorized under the "Beyond" part of Bed Bath & Beyond stores. In addition to regular scratchers, this store carries interesting variations, like a scratcher massage tool, which massages your back while it takes care of your itch. There are more than 900 of these stores in the United States, so chances are there is one nearby where you live. You can also shop for your scratcher on the online site: bedbathandbeyond.com.
Personalized Back Scratchers
You can also buy personalized back scratchers with your name or a special message etched on the handle, so there will be no confusion about to whom the scratcher belongs. This is a creative idea for personal use or to give as a promotional item. You can go to branders.com (see "Resources" for a direct link) or promopeddler.com/back_scratchers to get personalized back scratchers.