Where can I buy plugs to fill carpenter bee holes after killing them? I do not want to cut, glue, caulk, or saw.

In the past I have simply used wood filler from the local Home Depot or Lowe's.

Go to a woodworking supply store and ask for tapered wood plugs. They come in different sizes. Some HD's and Lowe's have them too. Here's a tip for Carpenter Bees. Gat a small piece of a cotton ball, put a couple of drops of Sevin on it and put it in the hole before the plug. If they rebore the hole, and most likely will try, they will ingest the Sevin and it will kill them. Also Google "Carpenter Bee traps".