The cost of concrete
I worked on a concrete crew for a summer in '69. So I had a bit of experience.
My 1500 sq. ft. shop floor cost $2K when I had it done in '94.
Years later I wanted a parking pad and a driveway poured in front of my shop.
I borrowed some forms and set them up myself. My son was working construction so I got him and three buddies to do the pour and finish work for lunch and a case of beer. Two 30x30x4" pads for $800.00... was the only way I could afford to do it.