I would suggest looking at the Sonlight Curriculum website. There is a lot there, so be ready to spend some time. It's a great place to get ideas.
Chicka Chicka Boom Boom Q is for Duck If You Give A.... (mouse a cookie; pig a pancake, etc) Carefree Play, Summer Day Goodnight Moon Booklists as mentioned above...
Check out Paperbackswap They have a great forum site where you can get at least 4 books (like you need) for 1 credit. The credits can be bought on the forum site as well for about $2 each. So if you find someone who has alot of the books you want you can get them for $.25 each (which is the same as garage sales, without all the driving around Let me know if you need any help navigating the site.