Here's a site that has the material you need for radiant flooring. It will give you an idea of materials cost. I ordered my materials at the local lumber yard when they had one of those "% off" sales. You can use a water heater or a small ultra efficient boiler.
My new office and dog kennels will be heated with radiant floors. Makes a lot of sense because you're only heating the "people" area, not the ceiling. I'll do honey extracting there too because I'll have a floor drain and janitorial sink setup. Milk paneling on the walls...very easy to hose off and keep clean...actualy looks pretty nice too!
Buy locally, buy only humanely raised animals, eat in season, keep bees!