Here is the catalog for zetts. I think the combo Panhandleguy is looking at is on page 6.

http://zettsfishhatchery.com/sitebuildercontent/sitebuilderfiles/CompleteCatalog.pdf

The rosey red fatheads are like $45/lb at best and should be no more than $10/lb. Daphnia will already be in the pond at densities of several individuals per gallon of water. Added 500 would be like a drop in the bucket.