Good online sources for Zylkene?

We started buying Zylkene from Amazon.com since it was cheaper than buying it at the vet's office.  With all of Buddy's health issues and expenses, we need all the bargains we can get. ;-)

But the price keeps going up (about a 40% increase in the last four months), and we've been having to deal with a different third party vendor every month, which hasn't always worked out very well for us.

Does anyone have any suggestions re: other online sources that have a decent reputation, and offer a more stable price, and with reasonable shipping charges?  Oh heck, and while I'm at it, can anyone tell me how I can eat all of the chocolate I want and not gain weight? ;-)

Thanks much for your help!

I just saw this thread.  I'm sorry to hear about the Amazon supply--I've bought it there before but not for awhile.  Good luck finding a source.  

Re the chocolate.....wish I could help you (and us all!) with that one, too.