Brand New Melissa Sweet Lia Sz8 Looking To SWAP For A 6!

I bought a Melissa Sweet Lia dress in a size 8 in Ivory. It just came in a few days ago and it`s really too big! I need a size 6 instead. My wedding is in less than 3 weeks. It is brand new and has not been altered. I bought it for $3000 but am willing to sell it for $2600 OR if you happen to have the problem I have and need an 8, we can swap gowns! Please email me if you wouuld like to see pictures!