I personally would stay away from chains such as petco or petsmart if you're not too experienced with pacs. Your best bet is a nice mom and pop pet/reptile store or if you can order I would definitely give mike an email at mikesphatfrogs@yahoo.com
I have purchased many through him and have never been let down. From what I've seen on the forum IvoryReptiles also has a great reputation. Good luck on getting your new pac