charges more if your logged in with Facebook (was 13.64 before I logged in, was 14.14 after I logged in with Facebook. if I log in with Gmail or email/phone number, doesn't charge extra) also charges more per item. a foot long is $10 usually, but in the app, some are $11 and some are $17. doesn't make sense. is really buggy and slow app. I hate this app and how it charges.