Yesterday I went and picked up a yard of #78 gravel($32) and put together the cement mixer. Given the trailer was nearly over loaded I made another trip in my Scion and picked up rebar and 4 bags of cement($90). Expenses so far $192 on this project.
Started mixing concrete using this formula: 1 shovel Portland cement, 2 shovels sand and 3 shovels gravel. I tripled this formula and the mixer filled a wheelbarrow in no time. Around 2 gallons of rain water was added to make a soupy mix, just tilt the mixer into the wheelbarrow and go!
The cement mixer took all the work out of mixing, I'll say it was a really good $300 investment.