If you choose to create your poster as a single large-format document, here are a couple of options for printing:
Marlboro College Media Lab (top floor, Rice-Aron Library). Print up to 24" wide. Bring your own paper. Cost is $1.80 per square foot (of image, not of paper). An orientation is required to use the equipment; this can be done with Hilary Baker by appointment or with a scheduled Lab Monitor. The monitor schedule is posted on the entrance window to the Media Lab and on Hilary's office door. Hilary is also a great resource person for design and printing questions.
Lotus Graphics (Canal Street, Brattleboro; 802-257-1102) offers printing up to 36" wide. The cost is $6.99 per square foot (includes paper and ink). Files should be in PDF format.