Pullup Bar

[Efourdee]

I have the old fashioned metal bar that you screw plates into the door frame to attach.

I am looking for the one that stays on the door through the tension you place on the handles. Basically one of these
Pull Up Bar.

I can't seem to find any others through google, so before I go spending 100.00 bucks on a pullup bar, anyone know where they sell something like this for cheaper?