I agree about Greedy Nursery.com selling seedlings that are quite inappropriate for this time of year; BUT must differ about the heated propagator. I only bought one in February, wish I had bought it to get Aubergines and Peppers started off in January. I DO have a heated greenhouse (with just a frost buster type heater) and a conservatory that is unheated, but the boiler is in there. It , along with the g/h which is in it's 2nd year has revolutionised my gardening, am starting to understand far more about germination and ongoing cultivation.
I am not a beginner, but over the years have suffered so much disapointment from seeds not germinating through lack of heat, that I would recommend a heated propagator, mine does NOT have a thermostat, but gets switched off every morning (one could have it on a time switch) and any of the containers that show signs of growth; the ventilator gets opened.
In short, I am thrilled with my new toy