WTB mixing station

[ReefPharmer]

Hey guys and gals,
Before I buy the blue bins, I figured I'd check to see if anyone has a mixing station for sale? Looking for something in the 40-55 gallon range for each of the two barrels.
Thanks !

 

[VWHACK]

I have a couple new, never used water containers.
nearly 6' tall and 3' in diameter.
I believe they are 300 gallons each.