In 2015, LEGO released 23 Promotional sets across 6 subthemes, all of these sets have been retired. Subthemes for that year included Giants, LEGO Brand Store Opening Set, LEGO Brand Stores, Monthly Mini Model Build, Target, and Toys R Us. For that year, the total price of all retail sets cost $90, today those sets are valued around $1,640, a growth of 1723%.
Most valuable 2015 LEGO Promotional set
Clermont-Ferrand 1st Anniversary Exclusive Minifigure Pack $449.04
Highest growth 2015 Promotional set
5004077 2015 Target Minifigure Gift Set +2359.86%
Largest 2015 LEGO Promotional set
40143 Bricktober Bakery 234 pieces
Most owned 2015 Promotional set
40144 Bricktober Toys R Us Store
23 sets

40126 Alien

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Pieces 55
Availability Retired
40126 LEGO Monthly Mini Model Build Alien
promotional
Value $5.78
Annual growth 2.8%

40127 Space Shuttle

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Pieces 39
Availability Retired
40127 LEGO Monthly Mini Model Build Space Shuttle
promotional
Value $7.87
Annual growth 5.2%

40128 Robot

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Pieces 50
Availability Retired
40128 LEGO Monthly Mini Model Build Robot
promotional
Value $6.21
Annual growth 11.6%

40129 UFO

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Pieces 39
Availability Retired
40129 LEGO Monthly Mini Model Build UFO
promotional
Value $5.73
Annual growth 8.8%

40130 Koala

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Pieces 65
Availability Retired
40130 LEGO Monthly Mini Model Build Koala
promotional
Value $17.12
Annual growth 4.1%

40131 Parrot

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Pieces 55
Availability Retired
40131 LEGO Monthly Mini Model Build Parrot
promotional
Value $11.12
Annual growth 2.4%

40132 Whale

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Availability Retired
40132 LEGO Monthly Mini Model Build Whale
promotional
Value $6.25
Annual growth 3.4%

40133 Kangaroo

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Pieces 49
Availability Retired
40133 LEGO Monthly Mini Model Build Kangaroo
promotional
Value $5.73
Annual growth 9.8%

40134 Scuba Diver

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Availability Retired
40134 LEGO Monthly Mini Model Build Scuba Diver
promotional
Value $5.21
Annual growth 5.9%

40135 Angler Fish

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Pieces 29
Availability Retired
40135 LEGO Monthly Mini Model Build Angler Fish
promotional
Value $4.60
Annual growth 11.9%

40136 Shark

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Availability Retired
40136 LEGO Monthly Mini Model Build Shark
promotional
Value $9.40
Annual growth 3.2%

40137 Submarine

Theme / Subtheme Promotional / Monthly Mini Model Build
Year 2015
Availability Retired
40137 LEGO Monthly Mini Model Build Submarine
promotional
Value $4.34
Annual growth 10.9%

40141 Bricktober Hotel

Theme / Subtheme Promotional / Toys R Us
Year 2015
Pieces 204
Availability Retired
40141 LEGO Bricktober Hotel
Retail $19.99
Value $34.80
Growth  +74.1%
Annual growth 5.3%

40142 Bricktober Train Station

Theme / Subtheme Promotional / Toys R Us
Year 2015
Pieces 180
Availability Retired
40142 LEGO Bricktober Train Station
Retail $19.99
Value $30.00
Growth  +50.1%
Annual growth 2.1%

40143 Bricktober Bakery

Theme / Subtheme Promotional / Toys R Us
Year 2015
Pieces 234
Availability Retired
40143 LEGO Bricktober Bakery
Retail $19.99
Value $27.76
Growth  +38.9%
Annual growth 3.1%

40144 Bricktober Toys R Us Store

Theme / Subtheme Promotional / Toys R Us
Year 2015
Pieces 165
Availability Retired
40144 LEGO Bricktober Toys R Us Store
Retail $19.99
Value $34.70
Growth  +73.6%
Annual growth 5.1%

40146 Lufthansa Plane

Theme Promotional
Year 2015
Pieces / Minifigs 67 / 1
Availability Retired
40146 LEGO Lufthansa Plane
promotional
Value $57.04
Annual growth 3.1%

5004077 2015 Target Minifigure Gift Set

Theme / Subtheme Promotional / Target
Year 2015
Pieces / Minifigs 25 / 4
Availability Retired
5004077 LEGO 2015 Target Minifigure Gift Set
Retail $9.99
Value $245.74
Growth  +2359.9%
Annual growth 26.7%

Clermont-Ferrand 1st Anniversary Exclusive Minifigure Pack

Theme / Subtheme Promotional / LEGO Brand Stores
Year 2015
Availability Retired
Clermont-Ferrand 1st Anniversary Exclusive Minifigure Pack
promotional
Value $449.04
Annual growth 14.7%

San Francisco Giants Baseball Player

Theme / Subtheme Promotional / Giants
Year 2015
Availability Retired
LEGO San Francisco Giants Baseball Player
promotional
Value $78.87
Annual growth 6.1%

Lyon France Exclusive Minifigure Pack

Theme / Subtheme Promotional / LEGO Brand Store Opening Set
Year 2015
Availability Retired
Lyon France Exclusive Minifigure Pack
promotional
Value $270.20
Annual growth 3.3%

Newcastle First Anniversary Minifigs

Theme / Subtheme Promotional / LEGO Brand Stores
Year 2015
Availability Retired
Newcastle First Anniversary Minifigs
promotional
Value $277.15
Annual growth 7.2%

Micro White House

Theme Promotional
Year 2015
Pieces 59
Availability Retired
LEGO Micro White House
promotional
Value $45.14
Annual growth 18.2%