Just a few observations.

Fry's Electronics has advertised the unit at $1800 with free installation (voice unit not included). Many shops will do free (basic) installations once the unit prices get over $150 to $200.

The AVIC-N1 is available from several eBay shops for about $1450. The voice units sell for about $40. How much a shop would want for installing an AVIC-N1 that they didn't sell you I don't know.

A smaller shop will have to pay more for the unit than a high volume dealer like fry's or some eBay shops.

Overall it seems the $1999 plus $100 is a bit high.