I use entirely pets for Proviable DC and Cosequin (and Denosyl, when I was using it). I've been shopping with them for years.
I've only twice had a problem with them and both involved an alternative shipping method they used. Rather than sending priority mail for some reason they used a system called Global Post. Both times they used this method the order took weeks to get to me and the package was in very bad shape. I complained both times. Both instances were about 2 years ago.
I looked for other stores, but entirely pets still came out on top for price and availability for my needs, so I gave them another try.
The last two orders came quickly, and the packaging was fine.