Hey there! That's a great question, as finding a steady supply of quarters can sometimes be a real challenge. Don't worry, you've got plenty of good options.
Your most reliable bet is almost always a bank or credit union. You can just go inside to a teller and ask to exchange a $10 or $20 bill for rolls of quarters. While some banks prefer you to be a customer, many will happily help you out. Going to the bank is great for stocking up so you don't have to hunt for change every laundry day.
Another fantastic place to try is the customer service desk at your local grocery store. They are used to this kind of request and can usually swap your bills for quarters without any issue.
If you need quarters in a pinch, look for places that have change machines. Self-service car washes and arcades are perfect for this. While laundromats also have change machines, it's generally considered good etiquette to only use them if you're a customer. You might also find that your own apartment building has a change machine in the laundry room, so it's always worth a look!
Finally, you can try asking for change at a gas station or convenience store. It helps to be polite and maybe buy a small item first. And there's always the classic vending machine trick: put in a dollar bill and press the coin return button. It doesn't always work, but it can be a lifesaver when you're out of other options
