Try

http://www.bookfinder.com/search/?ac=sl&st=sl&qi=8225kGfT2Yus8ibVJ6FEvKAxLBc_4354306868_1:4:61&bq=author%3Dkenneth%2520h.%2520phillips%26title%3Dteaching%2520kids%2520to%2520sing

£49.99 is the cheapest.