Where can I find Power Supply for Dell Optiplex GX60 tower desktop

[bulisani]

Freind of mine just gave me this dell, swears everything works on it but there is no power supply.
I been looking around, third party power supply will not fit, or have on/off switch in the back, basically will not work.
I would get a new case but i was trying to spend as little as i can.

Please help, any suggestions welcome.

thank in advance for your help

 

[dopefisher]

What are the dimensions of the power supply? Find that out and do a froogle or ebay search for one then.