If you think it is good for you the annual membership online is just $5 a month. There has been a lot of reasons that have been brought up for joining and not one of them fits me. I can string any racket you put in my hand almost all the time without Looking up a pattern. I don't like free string if it is just 1zies and 2zies. I can get all the tips I need elsewhere. But not one person has mentioned the certification process. If I were to join the USRSA it would be my only reason. Not that it would make me a better stringer but only that I would be perceived as a better stringer because of the certification. If you are running a business that should pay for itself easily and it is a tax write off.
I have the ability to drive people crazy, not sure if I was born with it or I learned it but I'm damn good at it.