tat must be BRAND new prices. I would look at eBay if you wouldn't mind buying a used one.
http://search.ebay.com/search/search...t&BasicSearch=
I believe in 1999 Honda change the stock wiring plug in the car htat plugs into the back of the deck. If you get one for a pre '99 Integra ('98 or older) it'll plug right in. Otherwise if you get one from a '99 you gotta do some custom wiring. IT's hard for me to explain but I'm sure other nkwo what I'm talking about.

Good Luck!!