May I offer you a warm welcome to the CameraLabs forum.
It's a fair question though the ultra-suspicious might think that, as a first post here at CameraLabs, it's sailing perilously close to being an advert, something we don't allow here on the forum.
You don't say where you are but I'll assume it is the States and refer you to this Amazon page
for used D3000 kits. You can also check out ebay as well. So much depends on the condition of the camera and also, to an extent, the trust that any potential purchaser has in you.
But I would ask that we do not get into a further discussion about the condition of your D3000 as I would definitely regard such a discussion as an attempt to sell the camera here on the forum.