A 30x30cm Mirror (which is enough to get the image to the camera) costs about 12$ with a quick google search. It's even high quality silver. With a small price

A 30x30cm Mirror (which is enough to get the image to the camera) costs about 12$ with a quick google search. It's even high quality silver. With a small price at the start you can probably 3D print an apparatus that contains stabilizers for both camera and mirror plus a mechanism to easily swap mirrors.