Don't buy from the dealership. They charged me $250.17 for one just last month. I only paid it because they replaced it before I could tell them not to. Anyways, just go to Checker and ask for a regular old O2 sensor for your year integra (~$40). Have fun getting the old one off, but it'll save you $210.17.
I guess if you want Authentic OEM parts then, you have to go through the dealer.