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A consideration should be made for the Hewlitt Packard printer/plotter line.
A size will go from $325 thru E size at $6000. You will find that largest
demand will be for A size.
Another consideration that has to be made is cost of supplies. As size goes
up, so does cost. A possible solution to this is to charge for the materials
consumed. Again the A size will win out.
PS I am not a HP representative; however, I think that they have the best
affordable products on the market.