AtariNesSega

Looking for working Atari 5200 controller or controllers please help.

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My controller goes up down an left an when I take it apart I can turn the little knob inside an it will go right when I put it back together it wont help needed?

I am looking for some atari proline controllers for the 7800 the ones with two buttons does anyone have any?

how much for the 7800 controllers?