- Denny Manufacturing - 72 dpi (I've seen these banners in person and they are beautiful)
- Got Print 150 dpi
- ACI - 180 dpi
- Colorado Timberline
- H & H Color Labs
- Team Imaging
- Buildasign - Must be less than 20MB in size
EASYDigitals.com has a banner product! Check it out!
More info on printing EASYdigitals.com products as banners here.