If cost is a big part of the equation, and you just need printing, consider Souldraw. A quick forum search will land you several reviews.
Jammin0 used them for his Ninja Monkeys build.
Their adhesive isn't as strong as the higher priced places using 3M vinyl, but you can work around that by installing the t-molding so it covers the edge of the vinyl like Rikitiki shows in his Side Art Install 101 videos.
Scott