Each birdhouse is custom built and unique, therefore the prices equally vary.
Smaller bird houses that can be attached to a tree or fence are typically between $25-$40 CDN.
Larger bird houses on driftwood typically range between $50-$85 CDN
For instance, the birdhouse with the outhouse (a favourite of mine, the door to the outhouse even opened!) sold for $85. The birdhouse with the rocks around the entrance sold for $60. Houses that are built on driftwood are typically 6' tall or more, and are meant to be cemented a few feet into a spot in your garden.
I have also made one that is more apartment size and would fit in a corner or on a small patio - decoration only really.
Each piece of wood lends itself to something unique i.e. outhouse, chimney and a woodpile, mail boxes (who doesn't love to get mail..) rope bridges and tire swings (just for fun). I think they should be a place for our feathered friends and us to enjoy.
As well, each one has a portion of the roof or other place, that opens for cleaning - everyone needs a spring clean ad birds are no different. The houses need to be free of last years 'debris' so they can start fresh and new!