Where an I get small rubber tip feet for a few metal wire stands I have?
You could make them. Use a plastic dip that will form the desired feet when it dries. There are several types of this material. It is inexpensive and easy to use. You can even get it in several different colors. Another option might be to use silicon. You can buy this in tubes at any hardware store. One might even try making a small mold that will take a small blob of silicon adhesive. Let this foot dry in the mold, with the wire inside the blob. If you are careful to use a release agent, the silicon will not stick to the mold. You could even make all the feet at once for a single stand.