Any decent flatbed scanner should do the job. Check out the Canon LiDE 110 or the HP Scanjet G2410. Should cost around 3.5k to 4k. If you are so inclined, you could also get a multifunction device (Print, scan and copy) in your budget.
EDIT: Noticed the "negatives" part just now. HP G3110 or Canon LiDE700F should fit your budget.