I just checked valleyvet.com in case you're interested in the Feliway stuff. The starter kit is $26.75 for one, $24.95 for 2. The refills are $15.95 or 3 @ $13.95 each. I believe shipping is free too! They do carry the happy dog stuff too.
Hopefully it's okay to post this here. I have no affiliation with the company, I'm just all about saving the $$$!