Where is a good cheap place to order a oxygen sensor for you car?

http://www.collegehillshondaparts.com/

College Hills offers discount prices on genuine Honda parts.

Be sure to get a Denso Oxygen Sensor for your Honda. Denso makes them for Honda.

I asked where is a good cheap place to buy a oxygen sensor for my car and I you gave me a website now is there any other place I can go?

Have you checked auto stores like Napa? They sell the ones with the universal ends on them so you can use it anywhere in the system. Not just a specific location.