hey Dennis! this is a set of 20th anniversary, and i have the 25th anniversary set.
The price is relatively high.. about 60-80$ i suppose, David Spragg could tell you more about it.

The link is here: Resorts 20th Anniversary Collector Series http://www.callzia.com/dghome/acchips/res-20th-set1.htm

here is the set that i have: Resorts 25th Anniversary Collector Series http://www.callzia.com/dghome/acchips/res-25th-set1.htm