Mason bees are so fun to watch!! There is a wide selection of set ups for mason bees online. If you want to buy locally I have seen them at the birding store on Kipling near C-470. My mother-in-law, who lives in Sun City, California, actually had a mason bee set up shop in her wind chime. She sits outside for hours watching the bees come and go as they set up in the small tubes. They don't seem to mind the fact that they swing all around when the wind blows.
Busy Bee Farm