Tim,
Try
www.walthers.com. Once you get to the homepage,use the shop tag on the top of the page to get a search function fo rtheir catalogue. Type "Evergreen" into the the manufacturer and off you go. Their prices are comparable to the LHS prices around here and you can see all of your potential choices for strip, rod, tubing, etc... There are lots of items in thier catalogue that you can use for armor modeling.
HTH
John