So it's now only 4 weeks until I go to the US for the first time, so excited to be going to PAX. I've got most things sorted out now. Have a Monzo card topped up which I will mainly be using for spending as there's no currency conversion fees but I want to take some cash with me but most places I see have a minimum £300-£400 order. What would be the best place to order dollars from and are there any places which do smaller amounts?