Here's my $0.02:
The Ring Lord (
http://theringlord.com) sells Ti by the tenth of a pound. Unfortunately they only supply 0.08" dia. and below wire. I ordered some 0.080" TI-AL2-V2 and it ran $0.71/ft and some 0.063" - TI-AL6-V4 that ran $0.45/ft. I haven't received it yet so I really can give a report, but the prices seem pretty reasonable.
I also just bought some 0.093" X 36" sticks of ERTi-1 (CP Grade 1) off of ebay and can spare a few of those if anyone is interested (I haven't received those yet either).
Dean