'99 GLi 1.6 Civic o2 sensor faulty

Hi guys, I need your help / advice...

My '99 GLi 1.6 Civic's "check engine" light has been coming on and it's been diagnosed as a faulty o2 sensor. Problem is Honda wants $571 to replace it with new genuine o2 sensor from Japan. That's just too much.

Is there a cheaper aftermarket alternative available, and if so where can I source it from? How easy is it to swap out myself?

Really appreciate any help.

Thanks.

if you are in sydney you can come take my spare one for 30bucks lol

Wow thats overpriced, take 2mprs's one or buy a new one off ebay

Would this one fit my Civic?

http://www.ebay.com.au/itm/120529036...84.m1423.l2649

you can get brand new aftermarket for under $100

isnt there 2 02 sensor's? find out which one first