I never seen one. How do they work without hurting the bees? plus, where can you buy one?
Used correctly, they can really help, they can also kill lots of bees, especially the queen. I had not used one until recently, I messed up
uniting 3 different groups of bees, left out the newspaper between
two supers and had a real mess of bees in town near too many homes.
I grabed a shop vac unaltered in a few minutes I had them all in side
most of them dead but under controll. I now dont do such in the back yard. Regulation of the amount of suction is paramount to proper operation. I built the one from bee source and use a slick hose and
padded the interior with foam rubber when I use it I seldom kill
any bees. I only use it to collect a feral hive, in my oponion it is too
slow and not necessary for a swarm. Try Bushy Mountain, they used
to advertise one for sale.