The plastic piece right on the lever itself broke after less then three years of use. Where is a good place to buy a replacement? Are they available at Home Depot or Lowes or do I need to buy online? Mine has the silver metal lever and I looked at one place online and they wanted $52 for a replacement. Yikes, are they really that expensive? Also the flapper leaks a little bit sometimes. If I reflush it or move it slightly, the leaking usually stops. I don't think it started leaking until I started using the chlorine drop in disks. Are they bad for the toilet innards?