Outer Limits 4x4 Board

Hi guys
chasing some stainless steel tube for a snorkel i did a seach but nothing came to eye
iam wondering do they make 3.5'' tube the guy thats doing it said no but it doesn't hurt to ask
3'' is abit small i think and 4'' is abit of overkill , im located on the sunshine coast
where would be the best and cheapest place to souce it from and also some alloy for body lift blocks (And someone with a lathe )
cheers

Apparently 3.5" is mega expensive, stick to 3 or 4.
Also, this was covered in a thread on here, like less than a week ago. Do a search or just go through a couple of pages of threads.