Genki Nishikigoi carries many Momotaro koi out here on the west coast. Likely that Kevin has a male around somewhere but equally likely it is not of breeding age.
If Momo is the way you want to go, you'll hafta beg for something local. Ask around your koi club. Maybe you'll find the best male in your area isn't a Momotaro...
Here is a good candidate male from Genki: #403 on
http://www.genkikoi.com/koisale4.html
It is a Maruyama, and also very good for parent stock. That particular koi has some demerits that would not let it do well in a show but the stock still looks excellent for breeding, in my humble opinion.