Making rewing equipment is all about what you can make for free: $200 for 3' of stainless rod on TradeMe seems a little pricey. Anyone ever tapped into this? http://wellington.nothrow.co.nz/index.html
Make friends with your local scrappy. Take him a few brews for Christmas etc. My local scrappy lets me wonder around his scrap metal yard and pick what I want. Don't always come up with anything but a trip earlier this year netted me a bundle of stainless steel tube in various sizes plus some stainless box section all for $20. My most recent visit got me some heavy steel plate for the side frames of my grain mill (under construction), when I asked how much, I was told "Aw, I'll catch you next time."