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Bookmarkers who show the max stake ?! | Arbusers
Other sites that show the max stake are Ladbrokes and William Hill (you can click on Check Bet before placing the bet)
Other places have a two step process.
Before confirming the bet they show the stake and profit. I think if this works then the bet shoul be accepted, but cannot tell for sure. For example in Bwin, Unibet, 5Dimes or Partybets.