In 1997, LEGO released 3 Town Promotional sets, all of these sets have been retired. For that year, the total price of all retail sets cost $28, today those sets are valued around $575, a growth of 1953%.
Most valuable 1997 LEGO Town Promotional set
2181 Infomaniac $316.76
Highest growth 1997 Town Promotional set
2147 Dragon Fly +63.42%
Largest 1997 LEGO Town Promotional set
2149 Color Line Container Lorry 191 pieces
3 sets

2147 Dragon Fly

Theme / Subtheme Town / Promotional
Year 1997
Pieces / Minifigs 183 / 2
Availability Retired
2147 LEGO Dragon Fly
Retail $27.99
Value $45.74
Growth  +63.4%
Annual growth 2.0%

2149 Color Line Container Lorry

Theme / Subtheme Town / Promotional
Year 1997
Pieces / Minifigs 191 / 1
Availability Retired
2149 LEGO Color Line Container Lorry
promotional
Value $212.27
Annual growth 2.7%

2181 Infomaniac

Theme / Subtheme Town / Promotional
Year 1997
Pieces / Minifigs 4 / 1
Availability Retired
2181 LEGO Infomaniac
promotional
Value $316.76
Annual growth 11.5%