At the top of every page on RCU is a button labeled "SEARCH." On this site, it really is your friend.

If you search for Raidentech you'll find lots of bad reports and some good ones.

Here are the addresses of three online sellers (in alphabetical order) that have a good reputation:
www.globalhobby.net
www.horizonhobby.com
www.towerhobbies.com
I know there are other good suppliers, but, these are a good starting point.