At LV43 the players with 128 'M are 1st class fast trainers.
But there are also "hidden" ft with the value of 127' M, as 3*-4* players of the market.
When you train them and become 5-6*, their value gonna raise to 128'.
How do we find them ?
With the classic trick, sorting the current list of auctions and see if there are 3*-4* players in the top, above players of 5*-6*.
Of course you need more greens to improve them to competitive 6*-7* players but they earn a new position or sa quicker (remember always start with this and later the skills).