If you spend the $70, you should end up with a camera which works properly, and which should work for several more years. If you try to find another camera, you may get a good one, or simply end up with another camera which doesn't work.
The dim focus aid is a little bit of a problem, but you can deal with it in a couple ways. Take a look through the viewfinder of the camera and look at the center, there should be a lighter colored spot which is square in shape, this is called the rangefinder "patch". It is usually reflected off a semi-reflective mirror. In time this mirror can deteriorate, making the patch less visible. You can either replace the mirror (and these are difficult to find) or increase contrast by putting a sticker the same size and shape as the rangefinder patch on the glass viewfinder window (on the front of the camera) directly in the center.