In 2004, LEGO released 4 Promotional Easter sets, all of these sets have been retired.
Most valuable 2004 LEGO Promotional Easter set
4212852 Easter Egg Blue $139.62
Most owned 2004 Promotional Easter set
4212847 Easter Chick in Egg
4 sets

4212838 Easter Chick

Theme / Subtheme Promotional / Easter
Year 2004
Pieces 62
Availability Retired
4212838 LEGO Easter Chick
promotional
Value $61.26
Annual growth 17.4%

4212847 Easter Chick in Egg

Theme / Subtheme Promotional / Easter
Year 2004
Pieces 99
Availability Retired
4212847 LEGO Easter Chick in Egg
promotional
Value $81.52
Annual growth 18.6%

4212850 Easter Egg Orange

Theme / Subtheme Promotional / Easter
Year 2004
Availability Retired
4212850 LEGO Easter Egg Orange
promotional
Value $67.97
Annual growth 17.8%

4212852 Easter Egg Blue

Theme / Subtheme Promotional / Easter
Year 2004
Pieces 178
Availability Retired
4212852 LEGO Easter Egg Blue
promotional
Value $139.62
Annual growth 7.3%