Totally not sure about lead time or of any local suppliers, but I know for a fact these guys sell what you need.
http://www.alro.com/divSteel/MetalsG...PipeTube.aspx#
1251 told me about this place, so I'd suggest calling as soon as you can. They may even be kind enough to direct you to other suppliers more local to you.
Specifically look at page 10 dash 52 on this pdf
http://www.alro.com/dataCatalog/010-...um.pdf#Page=48
Again, I have no experience with this supplier, I just know they carry 6061-T6 1x2 tube with .062 wall thickness and that they are used by 1251.