To buy cheap sign language charts for common words means you are putting some energy in learning, or even teaching, the beautiful arts of sign language. If you are putting some energy in it you can get pretty good in signing. With the charts you can teach others more easy as it is to go and especially a way to show it to bigger groups of people.
Sign Language History
The ancient Socrates was the first person to say something about sign language: 'If we hadn't a voice or a tongue, and wanted to express things to one another, wouldn't we try to make signs by moving our hands, head and the rest of our body, just as dumb people do at present?'
Whether deaf people existed back then already as well is not clear, but the prediction Socrates made came true. People who are deaf are talking with their hands right now and they are reading lips.
With the deaf schools the sign language came along. Not that the deaf schools were teaching signing to the deaf, but if you group people they will start communicating. In the sad case of deaf people they cannot communicate through speaking, so they invented their own language. Exactly the reason why there are as many types of sign languages as there are normal languages. There wasn't a centralized type of sign language, it is developed everywhere in the world!
Buy Cheap Sign Language Charts for Common Words
Now if you are (or you will become) a teach in the art of signing, you might need to buy cheap sign language charts for common words to show to your class. And if you are somebody who is working with people, you might come across deaf people as well. So you may just want the charts lying around for when a deaf person comes along. For instance, if you are a doctor you will need to know how to sign 'pain', 'disease' or even 'stop scratching your wound, it is only getting worse this way!' (Won't count that under common words probably, haha!).
Luckily there are ways to buy cheap sign language charts for common words.
There are tons of online book shops where you can buy cheap sign language charts for common words. Some examples you can find on Amazon:
Beginning Signs. This set of signs contains the basic words in signing, from family members to the alphabet! And well, if you want to start signing, what is better than starting with the basic words? Right?
Obviously the younger generation goes to the internet immediately, but offline it is possible to buy cheap sign language charts for common words as well. You can try a deaf information center where they may sell these charts. Or maybe a normal book store. If you cannot find them at the normal book store, try out a medical book store!
This should have helped you in finding the charts you were looking for. While buying the charts may be easier, you don't have to. There are also free printable sign language charts for common words you can use. But if you have the money, it will be easier to buy cheap sign language charts for common words.