scan it- enlarge it to the size you want then print it off in sections which you then need to tape together-
or
i picked up an inexpensive projector from joannes---i can put a picture that size on the projector plate and project it onto a wall- about any size i want- hang my pattern paper on the wall- project image- then trace- it's not a great projector- but it does the job (cost about $27 i think---might be less expensive than Kinko's and you have it for future use.