the sponsor which showed up for this post may have what you need:

http://www.vegherb.com/frame_shopping_raisedbed.htm

Hi,
You could use gate hardware. Some of it is very decorartive.

Loretta

Hi,

I'm also looking for the corner brackets to assemble raised beds but don't need anything decorative. The brackets I am looking for allow you to slip the end of the boards into them. I have some physical limitations and the corner brackets would be a great help to me.

VioletAnn

Maybe hardware that is used for building decks or attaching rafters would work. They make quite a wide variety of functional pieces. We just staggered (maybe called dovetail) our landscape timbers and used 6' nails then put a 1 x 6 around the top If you drill your holes first it is easy to nail them in.

Loretta