Amazon has released some cute and fun Chelsea playsets. I know there are not a great deal of Chelsea/Kelly colelctors out there but these sets are really cute.
Barbie Dreamtopia Sweetville Kingdom Chelsea & Sandwich Friend Doll
Barbie Dreamtopia Sweetville Kingdom Chelsea & Cookie Friend Doll
There also are some new Barbie playsets.
Barbie Dolphin Magic Ocean View Boat Playset
Chelseas are cute, but I hate their painted dress. :-(