source for Ti foil/sheet?

I'm surprised that you didn't find anything on ebay. I usually see a lot of Ti foil on ebay. You could try Suluk46. I don't have time to check right now if they are still offering it.

seekoutside has some

What thickness are you looking for?

I found several, ebay titanium foil.

Kevin your site only lists 2 dimensions for the foil: thickness X height(assuming)…is this priced by the foot?

@Colin (covering eBay part below) I'll give Suluk46 another look. I remember seeing them offering pre-sized windscreens but not materials or cones.
***doesn't look like they sell sheets/foil anymore. I'll shoot them an email later though.

@Eric
This is the only one that might work for me. Everything else seems too thick or not wide enough (almost everything is under 4")
http://www.ebay.com/itm/15-3-3-3-Titanium-Foil-Sheet-005-x-6-0-x-72-0-37-/151011037070?pt=LH_DefaultDomain_0&hash=item2328f58f8e
For the caldera cone shape, you need extra width to fit (I'll likely need somethign like 12×18") the cone pattern.

@Kevin, thanks for the site. I'll check it out when I have some time (got back from lunch and just wanted to check this quick before catching back up on work)

By the foot, however we have several types around just shoot me an email what you are looking for

Thanks Kevin, I'll try to figure how what size I need tonight and get back to you.