I doubt that it's possible to recreate a kit-like metal sukka frame without spending hundreds of dollars, at least not without creative sourcing of the materials (e.g. finding them in a junk yard, or something).
A few years ago, I bought raw materials to extend an existing round-aluminum-tube-based kit I had (not like the newfangled kits with rectangle-cross-sectioned poles). I shopped around, and the best source I found for the tubes was http://metalsdepot.com. So let's take a look at their prices to get a ballpark estimate for the poles.
To match my kit, I ordered 6061 Aluminum Round Tube with an outer diameter of 1" and an inner diameter of .75". Other specifications may work, too, but unless you know how to do the engineering, I'd recommend against skimping on the thickness. Let's say you want to make a 6' cube without any horizontal or vertical members in the middles; that'll require 12 6' poles. The price at Metals Depot right now for those 12 tubes is $262. I'm not sure what the right dimensions of 6063 Aluminum Square Tube would be, but the comparable size there costs $253 for 12.
Add to that 8 connectors for the corners. I don't have handy records of which ones I used or how much they cost, but I suspect that 8 of them will probably cost around $100 or more. Note that these are pretty heavy-duty metal devices.
I conclude that the cost of new raw materials for a normal-sized metal sukka frame probably starts at at least $300 and hoes up from there with size and complexity.