Hey FP and Welcome !!!!
I got a dense mesh LoopLoc cover 2 years ago. It was a 20x40 with some custom work for side stairs and extra padding in that area. It was about $3300 out the door. $1750 for the cover, $1000 to install it (hardware and drilling holes in the patio), a 10% upcharge for grey (SO worth it, we hated the green one at the old place) and tax.
A solid cover would cost more, or also if it was more custom being a particurally weird shape.