Shred,
Here is the info on how they want you to send your graphics:
We recommend you design your graphics in Illustrator, Photoshop, or Coreldraw full size at least 200 dpi and send us the disk (or email the file if it is under 5 megabytes). We do not guarantee hitting pantone colors exactly but get pretty close usually.
Any number of colors is fine (art, photos etc are OK) - you simply design in RGB or CMYK
We recommend designing the graphic rectangular in shape at 13" wide by about 2" longer than you need to allow for shrinkage and bleed
Cost is $39 including material for topsheets and $45 for bases including a white flood coat behind the graphic, Price assumes we do not have to work on your file. If we do we will contact you with a quote