I had the Claudia/Jenny dollset. My sister had Kristy/Karen and Stacey/Charlotte. Sadly, the dolls are long gone! I did find that I still have Claudia's accessories though (sketchpad, painter's palette, etc). I'm keeping them because I think they're cool.
My sister also had the Baby-sitters Club board game growing up. I don't remember how it was played, but I remember liking it!
"This is what us sitters like about Mallory. She is totally levelheaded." - Claudia, Good-bye Stacey, Good-bye
I have Mary Anne, Stacey(3x), Claudia(2x), Dawn(2x) and Kristy from the 19 Inches series, Mary Anne/Jenny, Claudia/Jenny, Stacey/Charlotte and Kristy/Karen from the two packs sets, both board games and the Deluxe Party Gift Set. You can see my BSC collection in my You Tube Channel:
I have all of the big dolls, the party set, the newer barbie-sized dolls (I think it's Stacey and... Mallory?) that came out after the 19-inch ones, both games, a sleeping bag, a booklight, address books, journal, and various gifts from the collectors' club.
If you are interested, this site is the most comprehensive resource for collecting.