I was in a baby store shopping for a gift for my friend the other day, and I happened to notice that they sold replacement valves for the sippy cups my daughters use. They didn't have what I needed -- replacement tops for those same sippy cups, which our dog chewed on -- so I looked online, and voila! Playtex sells sippy cup tops individually. It would never have occurred to me to look online for replacement parts for things like sippy cups, but buying just the part I was missing instead of a whole new cup saved me money and saved the three lidless sippy cups I had from going in the garbage (they aren't labeled for recycling). I'm going to remember this in the future when just a part of something breaks -- why buy a whole new one when I can replace the broken part?