How to put down a large bet in vegas

Say you want to put down a dime, or 20,30k on some games or more like a whale right upfront at the cashier.

These guys bringing straight cash to the sportsbook , credit cards have limits, bitcoin ? - not talking online talking in person at the book

a dime, just walk into any book and place your bet. That's normally under the limits set by most books. Over the limit bets get a little tricky.I would think the best reading on the subject is either mattress mack, whom most know by now. He for years was trying to bet large amounts and theres articles about how he had to negotiate with all the books. Thats until I believe draft kings took ALL his action. And what I believe they called bettor X a few years ago. Who was hitting large parleys and bets all over vegas in football for millions.  

YOU BRING IN CASH OR WIRE THE MONEY INTO THE CAGE.  THIS ISN'T A MYSTERY LOL