Concrete costs between $4.00 to $8.00 per square foot of concrete.
If you want to have concrete delivered and poured for a 24x 24 area then you'll pay around $3,000.00 to $5,000.00 for the 24x24 slab of concrete.
So it's not very expensive but also not very cheap either.
But having someone come in a concrete truck to pour the concrete is much easier than handling bags of concrete and mixing them yourself.
It's also likely cheaper to have a concrete truck come pour the concrete which costs around $3,000.00 to $5,000.00 for the 24 x 24 slab of concrete.