I have a ds game and it is called petz dogz pack and it costs 30 how much do i sell it for....................?

hi my name is Breanne garrison and i have a game called petz dogz pack and it costs 30.00 dollars and i don't know how much to sell it for and if you can tell me that would be sooooo good and if you want it well just tell me where you live and i will see what i can do but don't count on getting it because i live in cocoa and i am 11 years old so ya thank you bye.