qosmio x775

On a journey to restore a bunch of cool laptops at home and in need of a new condition MXM GTX 560m card or like new is it possible today to find this unicorn? for a Qosmio x775-3DV78 (3D screen) have tried eBay and Aliexpress

Can anyone help me solve this issue? I am attaching a screenshot of Windows10 storage manager showing there's an apparent 52GB of temporary files (which there are not) but it makes me wonder if that's making Windows think my HD is that much smaller. The partition is over 100GB and WinDirStat...