I'm also looking for 2.5 gallon and 3 gallon kegs.
I'm in youngstown, Ohio. I used to live in Dublin/Columbus area for 5 years and just moved back. I have a great source for getting 15 gallon sanke kegs that are in great condition. If you need any let me know and i can put you in contact with this person.
I use the 15 gallon sanke kegs to ferment 10-12 gallon batches in and to also store Starsan solutions and PBW solutions.