Check out digikey.com, for US costs. Well that's one place but seems to be the cheapest in US as far as low qty sales. About $3.25 a piece for low qty. That's where I get mine. I bought 4 with some other parts paid like 27 bucks to advoid handling charge which whould have been more moiney.

BTW:
Jshwaa congratz on the baby. The 1st 10 years are easy. It's the next 20 you have to worry about