21Bet Price Boosts: Full Terms & Conditions. 21Bet Price Boosts are only valid for players living in the United Kingdom who are 18 years or over. Max stake may vary during the promotion in accordance with market conditions and individual limits. Please see the bet slip for up to date information on max stakes. 21Bet Price Boost odds are subject to price fluctuations. Selections made separately in an accumulator will not qualify for the boosted price and 21Bet will not be liable to pay the customer the difference in price. Where 21Bet suspects you are guilty of fraudulent activity, we reserve the right to suspend the promotion and/or withdraw some or all of the bets received by you pending further investigation.