I got the bales of Pro Mix HP on Craig's List for $25!!! I got 15 of them so I can take two to Jennifer when I go to Michigan. I actually don't use it to start seeds, just potting up and then I mix with other things, composted manure, compost, whatever I have otherwise I find it dries out too quickly,. Someone. told me if it dries out and runs off the top, add a bit of detergent to it. Not sure if they mean something like Dawn, or what.
Magic Blotch Mix I think...