Print your own copy of the minimal pairs flip book game for voicing and/or devoicing in the initial position of words (prevocalic). First, print the pages. Then, put printed pages in page protectors and use your own stickers to play the game. Directions on how to play the game are included in the "directions" pages of the game. The full printed book, reusable stickers and SLP data collection sheets are available for only $34.99 on www.sunnyspeech.com.