I have checked the record for my team at level 19. The maximum market price for the players I brought were 106M. Among these players, for 18 years old ones, average training progress with light sketching was 10.6-16.3 skill progress. For the only 19 years old one, average training progress was 18.8.

Probably there was players selling at 107M but they are very rare. You can get good one with 106M if they are not too close to 6 star.

I did not keep record of quality of these players on joining the team. But I believe that those 18 years old 106M fast trainers all just reached 5 star.