Don't know the name off hand, but it is the $37.95 from Brushy Mt. That's what I do, just move it from hive to hive. Only use it if there is absolutely no rain in the forecast. When you attach it to a hive, you have to have the screen open for a day or two for the bees to get used to the new entrance. Must empty trap drawer every day. Place pollen in a ziplok freezer bag and place in freezer.
Or you can just leave it on one hive and just remove the screen when not in use. Do not over use.