There are two continuations of the original 2-volume set of Waldo lineage.
1.Continuation #1 of the Waldo Genealogy, 1900-1943 by C.S. Waldo, 295 pages,1943, list price $46.50.
2.Continuation #2, Descendents of Cornelius Waldo with related lines and ancestry for 1-25 years, 1970-1995 (a continatuion of the 1883 and 1943 Waldo Genealogies) by George S. Waldo. 339 pages 1996, list price $49.00
Make your order by telephone as sometimes there are specials not listed on their web site.
As far as the name of your ancestor married to Lilly Champlin, all I have to go by is what's in the book.Maybe one of the supplements would have the information you needed.