In 1997, LEGO released 4 Western Cowboys sets, all of these sets have been retired. For that year, the total price of all retail sets cost $20, today those sets are valued around $366, a growth of 1732%.
Most valuable 1997 LEGO Western Cowboys set
6799 Showdown Canyon $167.93
Highest growth 1997 Western Cowboys set
6790 Bandit with Gun +2318.59%
4 sets

6706 Frontier Patrol

Theme / Subtheme Western / Cowboys
Year 1997
Pieces / Minifigs 30 / 3
Availability Retired
6706 LEGO Western Cowboys Frontier Patrol
Retail $5.99
Value $115.28
Growth  +1824.5%
Annual growth 6.1%

6790 Bandit with Gun

Theme / Subtheme Western / Cowboys
Year 1997
Pieces / Minifigs 21 / 1
Availability Retired
6790 LEGO Western Cowboys Bandit with Gun
Retail $1.99
Value $48.13
Growth  +2318.6%
Annual growth 7.7%

6791 Bandit's Wheelgun

Theme / Subtheme Western / Cowboys
Year 1997
Pieces / Minifigs 19 / 1
Availability Retired
6791 LEGO Western Cowboys Bandit's Wheelgun
Retail $1.99
Value $34.40
Growth  +1628.6%
Annual growth 6.0%

6799 Showdown Canyon

Theme / Subtheme Western / Cowboys
Year 1997
Pieces / Minifigs 75 / 4
Availability Retired
6799 LEGO Western Cowboys Showdown Canyon
Retail $9.99
Value $167.93
Growth  +1581.0%
Annual growth 8.0%