On Sunday 16th August I placed an order with "Langs", another with "Snyders" and yet another with "Model T Ranch".
Each order had similar dimensions, although Model T Ranch was MUCH heavier and Snyders was split into 2 with one being a long narrow tube.
Snyders was posted using FedEx's cheapest mode and the others were sent using USPS's cheapest mode.
Yesterday, 24th, the FedEx stuff arrived from Snyders. (via Australian Air Express). Today, and just 19 hours later, the USPS shipped stuff from Model T Ranch and Langs arrived. (via Australia Post).
8 days for fedEx and 9 days for USPS and that 1 day difference is around 40% different in price.