According to the fxpansion shop there is a path from Eco to BFD3 but at $314 it's not much of a saving and as CCLarry said, it you take the BFD2 path you definitely get your monies worth and I've seen BFD2 for around
$130 so you'd pay about the same as the Eco to BFD3 upgrade but you get BFD2 too
I have to go and slacken my belt now, too much gas
Steve