Black Berry Guitars

changing strings at guitar center?

i have an olp john petrucci guitar and i need to get the strings changed i tried it last night only to find that the strings flew off n almost hit me n the face cuz of the stupid locking tuners it has, i dont wanna waste another pack so if i go to guitar center and have them change the strings how much would they charge me ?
oh forgot to say would this be coverd by the 2 year service warranty thing ?

they charge you $30

How to change guitar strings with locking tuners