Many of us now have preschool students in our schools.  You may be interested in these free ebooks through Amazon. Also good for K and any adaptive classes you may teach.

These three ebooks are free today and usually $5.99
Wheels on the Bus
Five Little Monkeys
Old MacDonald
 
http://smile.amazon.com/Little-Monkeys-Jumpin-Bed-Count-ebook/dp/B00LBMO2IC/ref=zg_bs_155009011_f_16

http://smile.amazon.com/Old-MacDonald-had-Farm-Genius-ebook/dp/B00LBMO2I2/ref=pd_sim_kstore_2?ie=UTF8&refRID=0V94B8QA2TNSMHW998MW

http://smile.amazon.com/The-Wheels-Bus-Sing-Move-ebook/dp/B00LBMO2IM/ref=zg_bs_155009011_f_7