I've given previously owned games before as gifts, provided that the original/new copy doesn't come with a code then they aren't opposed. I really think, for me, it would depend on what it is, the condition, etc. Some things are not readily available in stores. For instance, I'm considering an air hockey table. Saw one in a flyer but if ones even better and in good condition I'd consider an online ad like the apps mentioned. With clothes, sometimes something like consignment can bring in an item that otherwise would be completely out of reach.