Karlzbad

Does anyone know where I can find a picture of where the 'bank 2 sensor 1' oxygen sensor is on a 98 maxima? Hopefully I can get at it from the top. Local Nissan dealer told me like $130 but I'm seeing them online for as low as $45.90(?) on oxygensensors.com which is a part of automedicsupply.com, which I have never heard of, are they cool to deal with or is there some other dealer I should look at?