I think everything I've needed a bunch of cement that had to mixed right (pad vs. post in ground) I've had a concrete truck come in. It might take a lot of pads to get get your money back. Also, it's the oddest thing: Every time I've had a concrete truck come in, I've _never_ missed getting 40 lb bags of concrete and working them.
Tackit: Antenna footings? What are you holding out on us about here. I used to do a lot of antenna work and raising. My only rule was "No Rohn 25". That stuff is just to flimsy.