On Tarq YT1300s go for a Min. 500k, Kojava, are you sure about the mass at 1mil? I bought mine for 500k and have 5Mil. mass. My friend bought a VT39 Decimator for 500k and with about 5 Mil mass as well. Firesprays go for about 10 Mil though.
Rixhkyxkk hvy, Med/Lt privateer fighters 100k
Advanced, Agressors, Bomber Ties go for about 100k
X, Y, B (longprobes) wings 100k
Krayt, A wings 500k
YT-1300, VT-39, Nova Couriers 500k
I only found these prices because I did a LOT of shopping around. Spent 2 days looking for the best vendors on all the planets. Your server/galaxy may vary in price and quality. But I'm not sure how these guys crank out the ships at a loss. Unless they are playing the "Loss Leader" game and shutting out the competition. My suggestion is to look around, if you can get prices comparable to those above your doing well. Good Hunting.