All packages weighing under 1 lb will be shipped USPS First Class.
Anything over 1 lb will be shipped using USPS Priority Mail and is based on weight or if it will fit in a flat rate mailer. 
Our shipping calculations are not always exact, and shipping overages of more than $1 will be refunded within 7 days, but usually sooner! 
Once your package is turned over to USPS, we have no control over it. Tracking will be emailed to you when your package is shipped.