LF: Connectable/interlocking metal tubing

[smokinreefer]

Any local source for something like this:

http://i690.photobucket.com/albums/vv267/shaong/69141335-E54E-4AD0-9650-63D90F03F12F_zpsfxjhqurw.png

Im wanting to make a frame/bracket for mounting some evergrow lights.

Thanks!