I've never seen a nail salon that charges you a $20 deposit for first time customers trying to book with them. The problem I have with that is they're taking money without you even being serviced. What if you don't like the nail service being provided? That's very discriminating especially when I've been to several nail salons and NEVER had to do a deposit.
Update: found out the reason being is because when I was on the phone with Sau he quoted an appointment available for Tuesday at 4:30pm. So I was like okay cool I'll keep it for now. When someone else called (who was also a first time customer) he didn't quote her the deposit. So it was definitely discrimination . Really sad & disheartening especially after seeing all of the good pictures of the work they do.