The price on the tag is not the price you pay

Sales tax is added at the register in most states, and it varies by city, so a $10 item rings up at $10.80 or so. Restaurants expect a tip of 18–20% on top of the bill, hotels add "resort fees" that aren't in the headline rate, and ticket sites add service charges at checkout. Budget about 25% above the listed prices and you won't be surprised.