In reply to Caralynh:
You can write a cheque for whatever amount you like. Paying it in will take the recipient a little longer than usual, as it will be over the cashier's floor limit and they will need to fetch senior staff who will smile greasily and ask if sir/madam has any plans for the money. When they are informed it is for a house purchase they will start attempting to sell home insurance, mortgages, wills etc.