: Sites like OnlineMetals.com and MetalsDepot.com allow you to select specific grades (like 304 or 316), shapes (round, square, or rectangular), and custom lengths that they will cut for you.

: Stores like Ace Hardware or Tractor Supply Co. often have small displays of raw metal shapes, including standard stainless steel tubes.

: Retailers like Amazon and eBay are great for fast shipping on standard precut sizes or small hobbyist quantities.