Is it possible to return an unopened Ipod for a different one?

I asked for the Ipod nano 8G for Christmas, and I’m pretty sure my parents already bought it so it’s to late to change my request; if I went into Best Buy to return it unopened and untouched could I exchange it for Ipod nano 16G?

You will need a receipt.

Apple iPod nano 16GB – Unboxing and Video Sample

ipod nano 16g
ipod nano 16g
ipod nano 16g