I just sent a key by UPS from Michigan to Florida. Overnight cost was $80.+. It was $34.00 for 2 days. Two day guaranteed ( we'll try) by USPS of an envelope was $37.00
Many internet vendors " drop ship" and it seems that all offer shipping alternatives an escalating cost from overnight to ground which can take up to 5 business days. That includes Amazon.
I have been amazed at how quickly a purchase was received---- and dismayed at delay. Such is life.