I use these guys for many things. They have it all. Their main business is wrapping trucks and such, but do banners and large posters for me when I need.
Out the door price for printing is/has been $6 sq. ft. & $4 sq ft for banners.
Mounting et al is extra. So a 4' x 6' size would run you about $144, making the $100 you were quoted not so bad...
$40 is most likely not realistic.
http://www.monstermediainc.com/
If you're looking to offset print and do a quantity, then you'll probably have to look for a large press, preferrably sheetfed.
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