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Mike, also bear in mind that a true storm jib will be high cut, to give you visibility under the sail and to let green water roll off the deck without tearing into the sail. It won't just be a "smaller job".
And, in theory, it will also be a bright color (red, yellow, orange) not plain white, so that you can be seen in case you need help or others need to avoid running you down. You can skip the color--but if the material and stitching aren't extra strong, you'll only be fooling yourself. Just getting a sail the right size won't be good.
Since they are usually cut relatively flat, simple, and strong, you might find that having one made by a loft isn't as expensive as you think. The size also should relate to the size of the reefed main (or storm main) so as to keep the boat balanced in higher winds, so if there is already a "stock" design for your boat, it is worth finding out what that is and trying to stay close to it.
Since you probably will not be interested in getting the last bit of speed and high tech design out of your storm jib I would say this is a very safe bet to ask around for bids from any loft that can supply a "decent" product, as opposed to looking for top notch racing sails. But since it is also a fairly short and simple sewing job--you may find your first choice loft can make it for less than you think, especially if you get the order in now, and tell them "anytime in the next 90 days" etc. will do for delivery.