First, tell them you are very indecisive and don't want to waste their time. Then tell them you are VERY interested and WASTE as much of their time as humanly possible. While doing this, make sure YOU are getting your work done, such as cleaning the house (Peepmaster made me say that) or those pizza designs you like doing (Peepmaster again). Keep almost getting to buying something, and then ask for the catalogue again and change your mind. Always send them away with a confident "I'm going to buy several of those when I next see you." and then invite them round on washing day or spring cleaning day and change your mind all over again. Point out that you enjoy their being round because you can get your work done while thinking about what to buy. Treat yourself to chocolate for every full ten hours of theirs you waste.