Where can I buy a lower abdominal exercise equipment?

I absolutely love that thing at the gym where youre in the air, resting on your forearms and you have to raise your knees/legs. It’s a great workout for your lower abdominals. Where can I find one to buy for my home? Please do not tell me about those silly chairs or rollers. I’m not interested in those!
I’m not sure what to search under. I dont know the name of it