In 1978, LEGO released 2 Town Promotional sets, all of these sets have been retired. For that year, the total price of all retail sets cost $33, today those sets are valued around $1,638, a growth of 4976%.
Most valuable 1978 LEGO Town Promotional set
1589 Main Street $1,200.61
Theme / Subtheme Town / Promotional
Year 1978
Pieces / Minifigs 458 / 5
Availability Retired
1589 LEGO Main Street
Retail $12.97
Value $1,200.61
Growth  9156.8%
Annual growth 10.4%
Theme / Subtheme Town / Promotional
Year 1978
Pieces / Minifigs 236 / 3
Availability Retired
1620-2 LEGO Chocolate Factory
Retail $19.95
Value $437.43
Growth  2092.6%
Annual growth 6.9%