In 1999, LEGO released 15 Castle sets in the subtheme Ninja, all of these sets have been retired. For that year, the total price of all retail sets cost $116, today those sets are valued around $1,951, a growth of 1584%.
Most valuable 1999 LEGO Castle set
3053 Emperor's Stronghold $462.07
Highest growth 1999 Castle set
1269 White Ninja +9129.10%
Most owned 1999 Castle set
3050 Shanghai Surprise
15 sets

1099 Ninja Blaster

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 24 / 1
Availability Retired
1099 LEGO Castle Ninja Blaster
Retail $1.99
Value $40.00
Growth  +1910.1%
Annual growth 7.8%

1184 Cart

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 24 / 1
Availability Retired
1184 LEGO Castle Ninja Cart
Retail $1.99
Value $75.49
Growth  +3693.5%
Annual growth 10.4%

1185 Raft

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 25 / 1
Availability Retired
1185 LEGO Castle Ninja Raft
Retail $1.99
Value $33.91
Growth  +1604.0%
Annual growth 6.9%

1186 Cart

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 25 / 1
Availability Retired
1186 LEGO Castle Ninja Cart
Retail $1.99
Value $46.76
Growth  +2249.7%
Annual growth 9.6%

1187 Glider

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 23 / 1
Availability Retired
1187 LEGO Castle Ninja Glider
Retail $1.99
Value $29.87
Growth  +1401.0%
Annual growth 8.0%

1269 White Ninja

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 23 / 1
Availability Retired
1269 LEGO Castle White Ninja
Retail $2.99
Value $275.95
Growth  +9129.1%
Annual growth 12.9%

3050 Shanghai Surprise

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 104 / 3
Availability Retired
3050 LEGO Castle Ninja Shanghai Surprise
Retail $11.99
Value $171.26
Growth  +1328.4%
Annual growth 8.4%

3051 Blaze Attack

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 145 / 2
Availability Retired
3051 LEGO Castle Ninja Blaze Attack
Retail $14.99
Value $108.16
Growth  +621.5%
Annual growth 5.7%

3052 Ninja Fire Fortress

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 169 / 3
Availability Retired
3052 LEGO Castle Ninja Fire Fortress
Retail $29.99
Value $219.15
Growth  +630.7%
Annual growth 7.0%

3053 Emperor's Stronghold

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 331 / 4
Availability Retired
3053 LEGO Castle Ninja Emperor's Stronghold
Retail $39.99
Value $462.07
Growth  +1055.5%
Annual growth 7.7%

3074 Red Ninja's Dragon Glider

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 20 / 1
Availability Retired
3074 LEGO Castle Red Ninja's Dragon Glider
promotional
Value $82.61
Annual growth 4.1%

3075 Ninja Master's Boat

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 21 / 1
Availability Retired
3075 LEGO Castle Ninja Master's Boat
promotional
Value $41.06
Annual growth 6.1%

3076 White Ninja's Tank

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 23 / 1
Availability Retired
3076 LEGO Castle White Ninja's Tank
promotional
Value $114.78
Annual growth 9.3%

3077 Ninja Shogun's Mini Base

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 22 / 1
Availability Retired
3077 LEGO Castle Ninja Shogun's Mini Base
promotional
Value $148.11
Annual growth 11.6%

4805 Ninja Knights

Theme / Subtheme Castle / Ninja
Year 1999
Pieces / Minifigs 31 / 5
Availability Retired
4805 LEGO Castle Ninja Knights
Retail $5.99
Value $101.98
Growth  +1602.5%
Annual growth 7.1%