So I've had these feeders from Brushy Mountain for 4 or 5 years. Cheaply made and truly only about 4 years of use before the frame holder tabs start to break off. BUT....they are still the best inside feeder I've ever had for growing 4 frame nucs in a 5 frame box. They hold 2 1/2 quarts and are the only feeder I've ever found that was truly a frame width. All the others are too wide to have 4 frames plus feeder in the box. And the floats mean ZERO bee drowning. They were $7 new. I'm down to my last dozen of them and I treat them like gold now. Brushy is out of business and I can't find anything about them in the US. Only thing is their Greek website...which is in Greek.
So, if you're holding a few of these, for nuc making, in my mind, you're sitting on a mint. And if you have a source for getting these, I'll be your new best friend.