Randy Alcorn has a bunch of videos posted on youtube. Many of them are short videos that you could use in a worship service, Sunday School or small group setting. Here is an example of one where Randy talks about putting your time and resources towards “better” things.
If you want to find some of his other videos go to: www.youtube.com and search for Randy Alcorn. You can also search for stewardship, generosity, giving, money, debt, personal finance to find other videos that may be helpful to you.