This is what I would like to know as well Alan, because the Minwax is very expensive, too expensive.
Wiping finish is pretty easy to make. Take your favorite poly and start cutting it with mineral spirits. Start with a 70/30 (poly/mineral spirits) mix to see if that works for you. You will most likely prefer a thinner mix. I believe a can of wipe on poly is close to 50/50.
So basically any good quality clear gloss Polyurethane would do thinned down