They sell the new coin op rods here on this site for a fair price... I've bought a few here no problem.
http://shop.foosball.com/fts-110-061.htmlYou may be able to find some in the used market... I found a complete set on eBay a while ago and luckily it turned out well... this said, used bars may involve slight bends, fatigue from prev straightening, rust / corrosion / pitting, worn / different finish, out of spec pin holes. Depends what you are looking for... performance or just a hack table...
You really gotta run the numbers on the home table... how many rods and how much the project will cost in total... compare this to craigslist for similar intact tables. I suppose you could attempt a frankenstein with another crap 5/8 table by getting out your micrometer.
If I recall... some tornado home rods may be 9/16"... so measure twice.