Low Poly 3d Model. A good place to start. Except glocks because the glock corporation doesn t like it when you make one of their pistols in 3d form.

7471 lowpoly free 3d models found. Available for free download in blend obj c4d 3ds max ma and many more formats. Free low poly 3d models for download files in 3ds max c4d maya blend obj fbx with royalty free license and extended usage rights.
This will give you the initial.
When you re working within such a tight budget you can afford to give yourself a head start. Low poly pistols 3d models. Low poly 3d models ready to view buy and download for free. For the island you could use a sphere to be your starting point.