If you have a dog, a plastic grocery bag makes an inexpensive, easy to carry pooper-scooper.  Just put the bag over the poop and maneuver it into the bag.  If you want something more professional, there are small scoops to carry or ones that you can use without even bending down.  There are also rolls of bags that attach to a leash.  PetSmart, Target, and Walmart have a variety.