In addition to the list of great sites below, also try "googling" the Gospel reading as many ideas are also available on Pintrest and other like sites!
http://catholicmom.com/category/sundays-gospel/
https://www.sermons4kids.com
http://www.sjeparish.org/worship/liturgies-childrensliturgy
http://catholicchildrensliturgy.blogspot.com/p/where-does-childrens-liturgy-fit-in.html
https://dskidsermons.com/this-sunday/
http://www.reallifeathome.com/category/home-and-family/faith/catholicism/ ... Great resource for small children!
http://catholicblogger1.blogspot.com/
http://www.catholickidsbulletin.com/
http://www.sadlierreligion.com/webelieve/weeksliturgy.cfm?section=resource
http://www.4catholiceducators.com/
http://www.pflaumweeklies.com/new_page/index.php
http://www.livingfaithkids.com/
http://www.joanyedwards.com/
http://easybreezysundayschool.blogspot.com/search?q=pharisees+try+to+trick+jesus (Great for craft ideas)