Hey there!
Yes they are very expensive but I got them for about 1/2 price no tax in Canada
I was so excited to use this method. But she HATES them!!!!! The buzz I guess freaked her out. So much so that when I flash her note cards without the forks she goes crazy! now I flash in front of the piano in a different room. Too bad b/c it is a great idea if your child can take the buzz. I started her at 12 mo. I'm going to try it again in the summer
Wish me luck!
The doc