They seem to cost a lot less than others - I looked it up when someone here said they bought on ebay - they look real nice. Hubby is having fun though making ours - and we are not carpenters but it is fun and the cats love it! It just he is soooooo slow to getting around to it. We have one and we have added to it to make it better but now i want another one - I think with two cats it would be best to have at least two. Debbie