It's just another possible assignment.
Go see them with the intention of learning whether you can work with them and they with you. Then find out what they really need - how many images, for which usages etc. Determine whether you'll need permits, an assitant, to bring in lights etc.
Make sure you know how much money you need to show a profit, know what your costs are (film, car expense, digital processing time, etc.) and decide on your markup for services and materials.
Then work up a bid.
Make an appointment with them to present the bid and have a contract ready in case they like the bid and are ready to sign.
Depending on the type of organization this could be basically an advertising job, or it could be a little local village association who just wants some nice pix to make a brocure or two.
You have to balance your bill against the whole range.
Non-profit just means they aren't in a profit making business, not that they don't pay full price for printing, catering, rent, utilities and all the other services they need - including photography.
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Emily L. Ferguson
mailto:elf@xxxxxxxx
508-563-6822
New England landscapes, wooden boats and races, press photography http://www.vsu.cape.com/~elf/