I know GW's pricing model is confusing at best because it accounts not only for the physical product but the power of the thing on the tabletop as well - plenty of examples of massed ranks for £20ish per unit of 10, or a single hero for £25!?
Anyway - I wonder if the wizard wagons aren't brilliantly powerful anymore in AoS and so like a used car salesman GW is just flogging them cheap nowadays?
Meh, all I know is I can get more product for less £££ so I'm happy... for now...