Benny's Educational Toys is one the most comprehensive Jewish supply websites I've found. You buy something from them once, and they send you coupons that usually fall around different holidays. They have holiday specific items, posters, and basic classroom supplies that fit better in a Jewish classroom. It's also reasonably priced.

G-dcast is a collection of short videos that correlate with different holidays or Torah portions. The appropriate age is listed, and many videos come with free lesson plans and resources to use. The also have a few apps that are also free to download.

This contains links to the most common prayers students learn while preparing for their Bar/Bat Mitzvahs. When you click on a specific prayer, the text in Hebrew shows up and students can listen to the whole prayer or line by line, either chanted or read.