Here is a multi-workout ab / back bench that lets you try a variety of moves to target your core muscles. The IRONMAN Triathlon Commercial Multi-Workout AB Bench has 650 lb weight capacity and accommodates heights 5′ to 6’4″. The bench supports 1 flat and 3 decline bench adjustments.
The bench comes with wheels, so you can get it out of the way easily. It has 1.5″ handle bars. You can get one for under $190 at this time.