Trade in available but not just for SA upgrade. Usual return terms if unhappy. SA upgrade still costs the difference between the two at full price. Though P50sa to P90sa is obviously available as upgrade.
P20 pre at £80 !!! start your NVA exploring for silly little money.
With me I work strictly on cost plus, not what I can get away with, and now doing some items in batch production instead of made to order has cut my costs, so this is being passed on, my slurp remains about the same.