Vegan cookie recipes:
http://vegweb.com/index.php?board=238.0
Some of them may or may not be vegan, as Vegweb also publishes ovo-lacto recipes, but Vegweb is still a great resource and highly recommended by this non-vegetarian (who cooks for a vegetarian).
As for where to find vegan cookies--well, around here they're everywhere. I'd recommend checking your local health food store/food co-op. There are about 10 different kinds of vegan cookies at ours.