3m does have a 54" offering designed for wraps called 780. But if you think Orafol is expensive I think you are going to be disappointed since there is nothing cheaper than orafol in 54" other than Chinese.
The 3m product isn't out yet and is going to be like $2000/roll
Our 3M rep mentioned this to me the last time he stopped by a few weeks ago (forever been trying to get us away from Nikkalite, we do also use 680CR when its specified) but from what he told me and what their website says about it, 48" is going to be the max width. That being said, since its technically not available yet they might very well ad a 54" roll size which would be nice. Up to now the Oracal has been the only one available in that width that I've been aware of other than the generic Chinese stuff which I've never bothered with.
The main page on 3M's site for reflective does now show the new 780.....
http://solutions.3m.com/wps/portal/3M/en_US/Graphics/3Mgraphics/Applications/Reflective-Films/
Of course since its new it will probably hit the market right around 25% more expensive than their 680 making it the new most expensive solvent printable reflective money can buy. Hard telling though, I was surprised that they are not making it an "Envision" product.