You don’t need expensive equipment to work on your core, but if you need some help, you may want to give the Wondercore 2 a look. This fitness device offers 180-degree range of motion, dual resistance, and an ergonomic back. It lets you try a bunch of moves to target your abs at home.
The machine measures 25 (H) x 85 (W) x 35 (D) cm. It can be assembled easily. More info is available here.