Used John Deere A85177 pro series mini hopper seed units. I have 31 units and can ship. This listing is for each but will combine shipping up to 6 units for $13.95. Currently set up for corn/cotton but other tubes available from JD for small grains. I can ship all for around $50 I would guess.
I also have 29 Air Bag A81757, A63129 down pressure assembly with brackets and air valves. Also have 4, 75mm air bag spacer brackets.