If you have a drill, they're stupid easy to make. Read about what size holes the bees in your area like. And leave a smooth edge on the entry! They won't use it if they sense a risk to their wings.

Might as well roll your own, not like you can reuse them after they nest. Mites and such are an issue.

[–] Drusas@kbin.social 6 points 1 year ago

You can reuse them, but you have to carefully clean the nesting holes. I have professionally made bee houses that I use. The wooden blocks that hold the nesting holes can be removed, opened, and sanitized. This also allows you to harvest cocoons to keep safe from predators/weather for the next year.