You can withdraw large amounts of cash from your checking account by going to the Teller inside the bank and filling out a withdrawal slip and letting the Teller know how much cash you want to withdraw.
The teller may have to get more cash if it's over $5,000.00 and if over $10,000.00 the bank teller is required to file a CTR (Currency Transaction Report) to FinCEN (Financial Crimes Enforcement Network).
A better and safer option when needing to make a large purchase is to write a check or get a Cashiers check instead of carrying around large amounts of cash which can get robbed or lost.
The amount of cash you can withdraw from a bank teller is between $5,000.00 to $10,000.00 a day depending on the bank.
As long as you have enough money in the checking or savings account you are allowed to withdraw any amount of it but the bank has limits to the amount of cash you can withdraw a day because the bank does not keep all that cash on hand.
The bank I bank with allows you to withdraw up to $5,000.00 a day in cash but I don't even have that much money anyway so to me it wouldn't matter.
If you need to withdraw more than $5,000.00 or $10,000.00 in cash you can withdraw some another day or let the bank know you will be withdrawing more and they may allow you to withdraw more cash but it can also be a security issue for you as well.
I would not want to carry more than $5,000.00 in cash on me either way.
If I need to buy something that is more than $5,000.00 I would write a check or get a Cashiers check instead.