Bk. 52, Mary Anne and too many babies - Bk. 53, Kristy for president - Bk. 54, Mallory and the dream horse.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The Babysitters Club collection 18 by Ann M. Martin. ISBN 0439995043. Published by Scholastic in 2000. Publication and catalogue information, links to buy online and reader comments.
