An unhelpful post, that I wished hadn't been posted before this page was;
"Wait for Xmas, and Santa will dislodge it.."..I know..
But Libby makes a point, you have some estimation how far up the chimney it is, and depending on the age of the house (unknown), it may be Victorian, with an upstairs fireplace, that can be knocked through, to access the chimney space, to remove said item? As a bricked up fire would be easier access, than removing the whole chimney brest.
Otherwise, upto the roof, and poke a pole down the chimney, to release the obstruction.
If you have access to roof ladders, then that is likely to be the cheaper option, although a DIY'er, climbing on a roof, is going to be scary, I prefer the knocking through an old fireplace, putting a few bricks back in, and a replaster/wallpaper session?