Bigjon9981,
If you go to Bilker's in Cincinnati, they will have the KP Coke, possibly in cans and 7up in cans in addition to Coke 2L. That was Passover 2004 & 2005 I got stuff there.
In Columbus, the Kroger in Bexley has the largest selection of passover food. They had tons of 2L and Dr. Browns 6 packs. Apparently Dr. Brown's only makes Black Cherry and Cream Soda KP. The Dr. Brown's will have a K-P below the Hebrew letter with the K in the middle. Without it, you're looking at standard HFCS.
Also in Columbus, the Giant Eagle stores have a good selection. The ones in Dublin (Perimeter Loop Road) and Upper Arlington (Tremont? or Kingsdale) carry the 2L of KP Coke. More may have it as well. You may be able to find it at a Kroger in Dayton that is in a Jewish area, if there is one (not sure where that would be).
Jungle Jim's in Cincinnati at least used to carry all sorts of cane sugar soda. All of the West Jefferson glass bottles use sucrose (Dr Pepper, Mt. Dew, A&W, RC Cola, etc). They had Dutch Coke, Dutch 7up, Limca, Thums Up, Mexican Coke, Pepsi, 7up, Sprite, and Jarritos (always sugar).
That picture was taken circa Passover 2006. There were a total of 16 bottles of KP coke at one point. That picture includes 9 six packs of KP coke, 4 bottles of KP Pepsi, 2 six packs of Dr Browns Black Cherry, and some leftover JJ's bottles (including Afri-Cola!) and 2005 7up.
There may be a few Afri Cola and about two cans of KP Coke and two Dr. Brown's KP BC left. The rest is all history. I plan on restocking for the following year