I'm not sure how thick you want them, but Michael's sells the silver Wilton Cake Drums. I've used them with 3 tiered cakes and I've never had a problem.
I buy from CK Products and BakeryCrafts. i like the design on the BakeryCrafts version better. You'll need to be able to set up a wholesale account for those suppliers, though. If you need to buy retail, try Oasis Supply. And remember to put "cake central" in the search box, and you'll find a 10% off coupon!
I found them at countrykitchensa.com for $4.75 each and also at thebakerskitchen.net for $5.99 each.
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