That is a drastic change!
You may want to look into priority flat rate boxes.
If your shipment fits into a large flat rate box (12" x 12" x 5.5") and weighs no more than 70 pounds then it costs $12.95 shipped anywhere in the U.S. The box itself is free.
They have two different smaller flat rate boxes that ship anywhere in the U.S. for $9.80. They are sized at 11" x 8.5" x 5.5" and 13.625" x 11.875" x 3.375".
USPS - Priority Mail Flat Rate Shipping Supplies
You can also calculate postage online:
Postage Price Calculator
I calculate, buy and print my postage online for my shipments. No surprises that way:
https://sss-web.usps.com/cns/landing.do