Where should I buy my ipod nano chromatic? Walmart or the Apple Store?

Okay so i wanna buy a ipod nano chromatic (green & 8GB) But i dont know what store to buy it from. Walmart has it cheaper, but i’m afraid that if i get it from there it might be cheap also. I mean i want good quality but i also want it cheap. What should I choose?? Or is there another store that has it cheap but good quality too?