Choosing the cheapest method to ship seems like a no brainer. Sometimes that method is Priority Mail by the USPS. 2-3 day delivery at a good price. However, the is not the reality. Your shipment is not guaranteed to be delivered in that time frame. Also, we are finding more and more packages being lost in the system for over a week or more at a time. They get picked up from us and then the tracking shows nothing. Doesn't show they have received it. Sometimes that results in a lost package, most times they eventually get added to the tracking system. In my opinion Fedex is more reliable even though it can cost a few dollars more. If your work is critical and you are in a situation where you need your parts please take these into consideration.