It's roughly a dollar a pound. It's slightly more expensive for me since I provide my own detergent instead of having them use theirs (I hate fragrances). Since I don't own my own machines (if I did, I'd use them instead), I think using theirs myself would come out to maybe 40-50 cents a pound, depending on the load.

Some restaurants do cater to specific diets, yes, especially in NYC. It totally depends on where you are though. I'm pescetarian (and 98% vegetarian) and there're tons of options in this city, and a bunch of vegan places I'll order from sometimes too. There's also a macrobiotic place that delivers to work.