I checked with the Ace paper tube company and I can get 2500 mason bee tubes for about 11 cents each + shipping. That's a lot, so I'm considering buying from somewhere else. Checking around on the internet it seems there's a lot of people making suprising money off of nesting tubes. Where's the cheapest place to pick up a couple hundred tubes? I have dozens and dozens of mazon bees nesting in the siding of my house, I'm relatively confident I can attract them.