I am having a great deal of fun knitting my own version of a Mobius Cowl scarf using Cat Bordhi's Moebius Cast On.
Cat Bordhi's method is available on You Tube. You can watch it as many times as you wish.
I used a size 9 - 40 inch circular needle and approximately 180 yards of DK weight yarn alternating with a cotton based novelty yarn. I cast on about 100 stitches. Once you get the hang of it I guarantee you that you cannot just make one.