Chuck,
I am in Fenton, Probably just north of you. I have gotten stuff from both places you quoted, but I believe that the Pond Guy gets his fish from Stoney Creek. I could be wrong but I thought I saw a picture of a Stoney Creek Truck in the Pond Guy advertisement. If you contact Stoney Creek maybe they can tell you when they will have a truck in your area. They do fish days in the spring and fall. That is how I got mine. There is another place that a couple people here at the office have gotten fish from that they really like. I have looked at an old price sheet of his and he does offer regular bluegills among other things. I have talked to him on the phone in the past and he seems knowledgeable but I don't know it from first hand experience. I plan on getting some golden shiners from him this spring. Here is a link to the internet information he has.
Imlay City