That one is a very difficult one. MR had a run but theirs was inaccurate in sizing and it never goes for less than 1000 dollars on ebay. I would recommend looking for a 3d model that's freely available only, having it 3d printed (probably for less than 100 dollars) and then assemble and paint it yourself.
It probably won't run you more than 150-200 in total and it's something relatively easy to do yourself.
Just talk to the printer first to try to avoid the 3D warping lines that sometimes appear.