Here is a complete list of all Hot August Nights chips.

Atlantis Reno $5 "Hot August Nights" 1997
Atlantis Reno $5 "Hot August Nights" 1998
Atlantis Reno $5 "Hot August Nights" 1999
Atlantis Reno $5 "Hot August Nights" 2000
Atlantis Reno $5 "Hot August Nights" 2001
Atlantis Reno $5 "Hot August Nights" 2002
Bally's Reno $5 "Hot August Nights" 1991
Boomtown Verdi $5 "Hot August Nights" 1997
Caesars Tahoe $5 "Hot August Nights" 2001
Caesars Tahoe $25 "Hot August Nights" 2001
Caesars Tahoe $5 "Hot August Nights" 2002
Caesars Tahoe $25 "Hot August Nights" 2002
Circus Circus Reno $5 "Summer Nites" 1992
Circus Circus Reno $2.50 "Hot August Nights" 1999
Circus Circus Reno $5 "Hot August Nights" 1999
Harrah's Reno $5 "Hot August Nights" 1993
Harrah's Reno $5 "Hot August Nights" 1994
Harrah's Reno $5 "Hot August Nights" 1995
Harrah's Reno $5 "Hot August Nights" 1996
Harrah's Reno $5 "Hot August Nights" 1997
Harrah's Reno $5 "Hot August Nights" 1998
Harrah's Reno $5 "Hot August Nights" 1999
Harrah's Reno $5 "Hot August Nights" 2000
Harrah's Reno $5 "Hot August Nights" 2001
Harrah's Reno $5 "Hot August Nights" 2002
Hilton Reno $5 "Hot August Nights" 1998
Hilton Reno $25 "Hot August Nights" 1998
Hilton Reno $5 "Hot August Nights" 1999
Hilton Reno $25 "Hot August Nights" 1999
Hilton Reno $5 "Hot August Nights" 2000
Hilton Reno $25 "Hot August Nights" 2000
Hilton Reno $5 "Hot August Nights" 2001
Hilton Reno $25 "Hot August Nights" 2001
Hilton Reno $5 "Hot August Nights" 2002
Hilton Reno $25 "Hot August Nights" 2002
Ore House "August Hot Nights" stack set 2000 ($1, $2, $5, $10, $25, $50)
Peppermill Reno $5 "Slot August Nights" (1993)
Peppermill Reno $5 "Peppermill In August" 1998
Peppermill Reno $5 "Hot August Nights" 1999
Peppermill Reno $5 "Summer of 2000" 2000
Peppermill Reno $5 "Hot August Nights" 2001
Peppermill Reno $5 "Hot August Nights" 2002
Silver Legacy $5 "Hot August Nights" 1999
Silver Legacy $5 "Hot August Nights" 2000
Silver Legacy $5 "Hot August Nights" 2001

You can see scans of all these chips at the following links. I do have most of them available for sale if you're looking to add to your collection.

http://www.renocasinochips.com/nevada/reno_sparks_le/
http://www.renocasinochips.com/nevada/tahoe/