Yesterday, I Just shipped a large MTH set box from Western Pa to California. Here are the apples to apples price comparisons between the three major shippers-dropping off at their business location and shipping to a residential address;
FEDEX ground 4 day $54.99. FEDEX 2 day air express $119.39
UPS ground 4-5 days $51.73 UPS 2 day air $150.95
USPS ground 7-8 days $42.19 USPS 2 day priority $60.60
Since I'm paying the shipping, I used the USPS ground.
A couple of other things. Last year the USPS eliminated the discount for purchasing shipping online. Also, this past January, both FEDEX and the USPS raised their rates-I don't know about UPS. In addition, if shipping involves crossing the Mississippi River whether East or West, both FEDEX and the USPS have a surcharge built into the cost-I was told this info by employees that I personally know who work for these 2 businesses.
Nick