I would say $10K is a good number to work with for a 2 car garage with the pad already down; maybe even a little high.
I just look at how much my costs were last year for the foundation for mine; and how much they went past the budget. I was counting on $2000-2500 and it was closer to $4000. (I went with the foundation because my back yard has a bit of a slope to it.)
Speaking of which, in case anybody needs any plywood for concrete forms, PM me. (It's all 1X8s and 3X8s.)
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