Where can i swap nikon d3000 to d3100?

Where can i swap nikon d3000 to d3100?

If you just bought it, I'm sure you can return it and buy a D3100

but you really can't swap seeing that the D3100 costs $150 more then the 3000

I doubt anyone or store is willing to swap it unless you pay additional cash on top of that. Sell it on craigslist then use that money on top of more money to buy it.