[GWN7]

Pouring bag concrete mix is hard dirty work. The lime from the concrete gets on your skin, in your eyes/mouth and burns. Add your sweat to that to make it worse. I've done it. Have the mixer and all the tools.

Look on Craigslist for 24 X 24 blocks. Lots of people pull them and sell used for 1/3 or less the new cost. Even at new retail your cost will be the same or less than what you would pay for the 100 bags of concrete.

Put them on a bed of gravel and then sand on top to lay the blocks on (this insures good drainage). The whole base might only cost you $100....