Just some extra help from someone whos been doing it awhile:
Tattoo Shops, Local CD stores (FYE, Best Buy, Grey Whale, etc.), Colleges, Eateries, Clubs(One of the more tedious, but rewarding), ANY parking lot(Just put em under the windshield wiper), Coffee Shops... All i can think of off top. Are all great locations. For eateries, ive found that if you go to the local, "After the club" stop, you can generally get a good drop of promo. The Coffee shops also serve as good places, due to the more "open minded" people that usually hang out round them parts. Hope that helps a LITTLE.
Oh n dont forget pictures, Britton does ask for flix every now and then, just for some proff that their moneys getting spent correctly.