I don't think it was ever marketed as an option, it's listed as an OEM accessory. Now that it and the Integra have been discontinued, it has become wildly popular amongst the 98-01 G3 crowd and it's pretty hard to find. Only a few Acura dealers still have any of these parts. Some dealers have even sold their remaining stock to people who are now selling them on eBay and message forums like this one. And, for what it's worth, the kit is not for the 94-97 Integra's, only for the 98-01 2-door coupes.

I have the kit, purchased the 5 pieces from 3 different sellers. Only two were in my color, so I had to have them painted to match. My front lip is looking good, but the rubber strip on my rear valances has relaxed or moved in some way since painting and I can now see the original Vogue Silver peeking through. I have ordered a replacement set of the rears in my color and will replace, then sell the rears currently on my car.

If you can't tell, I really like this body kit... it's very subtle.

...bad pic to follow...