Forest metals on ebay do 25x25 for under £6 for a 3 metre length.
I found a local supplier that does it for about a fiver.
I would agree with all the other posters that a flat pack is the way to go, that's what I did on my first build. You may be able to buy the steel cheaper but at the end you will most likely spend what you save on a saw and mis cuts.
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