thsmormonsmokes
Smoking Fanatic
^^This.^^Big enough so when you shake it all the ashes go down.
It might be hard to find stainless expanded metal, and if you do it is sure to be expensive. I don't see any reason to spend money that you don't have to spend. Just go with regular old steel. Look for it at Lowes and Home Depot where they keep all their metal. They usually package it in cardboard, so it winds up looking like an air filter for a home furnace. And don't let an employee tell you they don't have it without looking first. Every kid I've asked for expanded metal at HD or Lowes didn't know what it was and told me they didn't have it when they really did.
Most importantly, wear gloves when you're handling it. Unless you like stitches. It'll cut you if you look at it wrong.