how can If find expensive players ??

[Maccabi Haifa]

There are hot days and cold days in the auction. I'm at level 10 and last night i signed 2 18yr old new generated worth 30M + each. Which is a lot for my level and they cost me only 5 tokens which i thought was both lucky and a bargain!!!!!

Is there specific hot days so u can know when to login and buy? or it's random ..