Tent frame - need assistance

I am looking to create a rectangular tent frame, roughly about six feet wide, four feet deep, and six feet high. I need the top to be flat.
I was thinking of purchasing tent frame, which I believe is usually narrow diameter aluminium or plastic tubing, and then connect this tubing with 3-way joints. The joints would need to allow three tubes/poles to connect at right angles.
The simplest plan would look like a frame of a table: I'd use four poles to make the roof frame, and another four poles as supports. This structure would only require four of the 3-way connectors. If this turns out not to be strong enough, I could add a floor frame with another four poles at the bottom; this plan would require a total of 12 poles, and 8 of the 3-way connectors. Should be fairly cheap and easy to make, right?
Well, I spent some time at Home Depot, but I was unable to find any 3-way right-angle connectors (which I found a bit odd.) I also went to a local Eastern Mountain Sports, but there too I was unable to find anything. All I could find were complete kits for tents, none of which allowed for a flat top, and were of the wrong size. I've done a bit of searching on the web through Google, but not knowing the precise terminology, my searches turned up far too many hits. I looked at a couple of dozen sites, but didn't find anything suitable.
Could someone suggest where I could purchase materials needed to construct this rather simple frame? (From stores or websites.) Any help would be much appreciated.
Thanks,
Robert
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Robert wrote:

There's PVC conduit/piping/tubing in both the plumbing and electrical departments. The 1/4" and 1/2" in each department is a little different based on codes for those uses, but if you're just using it to make a frame for something, you can interchange the parts. (Some may be gray and others white, but that may not be a problem for you.)
In addition to finding a different collection of joints and connectors in each department, you'll also notice the long segments cost differently, and may come with bulb or without bulbs at one end to eliminate connectors.
--
Warren H.

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