Depends on wether I need the player or not.
I'd say 25 tokens for someone who's perfect for me on the TL, in a much needed position as a replacement.
10 tokens for a player id need as a sub or a reserve.
But saying that, most of the time I end up just bidding for my pride and dignity.
I remember shouting at my phone once, "JUST GIVE UP NOW, I CAN GO 500+ ROUNDS IF I NEED TO, YOU'RE JUST WASTING MINE AND YOUR OWN TOKENS!'