This ebay seller has them from time to time
http://www.ebay.com/sch/spacemonkeyfromthefuture/m.html?item=251293662470&rt=nc&nma=true&pt=US_Other_Video_Game_Accessories&si=iwxo%252B2q3KgUJmdjnillnUGVO4eU%253D&orig_cvip=true&hash=item3a8244fd06&_trksid=p2047675.l2562
The last one he sold was on the 23rd:
http://www.ebay.com/itm/Sega-Saturn-Pad-controller-adapter-converter-Playstation-2-PS2-/251293662470?pt=US_Other_Video_Game_Accessories&hash=item3a8244fd06&nma=true&si=iwxo%252B2q3KgUJmdjnillnUGVO4eU%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
This ebay seller has them from time to time
http://www.ebay.com/sch/spacemonkeyfromthefuture/m.html?item=251293662470&rt=nc&nma=true&pt=US_Other_Video_Game_Accessories&si=iwxo%252B2q3KgUJmdjnillnUGVO4eU%253D&orig_cvip=true&hash=item3a8244fd06&_trksid=p2047675.l2562
The last one he sold was on the 23rd:
http://www.ebay.com/itm/Sega-Saturn-Pad-controller-adapter-converter-Playstation-2-PS2-/251293662470?pt=US_Other_Video_Game_Accessories&hash=item3a8244fd06&nma=true&si=iwxo%252B2q3KgUJmdjnillnUGVO4eU%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
I could make one for you, but it would be more than that + shipping.
Could you make Saturn to 360 adapters?