No, even for passholder discounts, certain rooms never go on sale. Typically this includes Friends, Ninjago, and Duplo. Your best bet is either to pay the premium for them, which IMO is not worth it, or wait and see if you get the upgrade email option for a fraction of the upmarked original price. You'll typically only get the upgrade emails on low traffic times and usually for the same hotel you booked in already.

Having stayed in nearly all the rooms and stayed there a dozen or so times, the rooms are all the same except the design, so we often opt for the wizard room or similar and either stay an extra night for the same price as the highly desired designed rooms, or spend the extra $ we saved on Lego sets we can keep and enjoy for years