Got 2 x 250 ltr upright tanks (not baffled) one has a 50 ft inertia hose reel fitted to the side, they can be plumbed in together for a 500ltr system or operated separatly on two vehicles - £200 for the two. Or £140 for the one with teh inertia reel and £60 for the other.
I'm up in Northumberland so you would have to come and collect.
Regards.....Ian