ipv6 transit over tunneled connection

[Michael Ulitskiy <mulitskiy () acedsl com>]

Hello,

We're in the early stage of planning ipv6 deployment - learning/labbing/experimenting/etc.
We've got to the point when we're also planning to request initial ipv6 allocation from ARIN.
So I wonder what ipv6 transit options I have if my upstreams do not support native ipv6 connectivity?
I see Hurricane Electric tunnel broker BGP tunnel. Is there anything else? Either free or commercial?
Thanks,

Michael