FedEx is cheaper almost always, followed by UPS, and then USPS. The only time the post office wins is with priority flat rate boxes.
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I used to have that walled Challenger, then it got totaled...
2015 IASCA Welterweight Champion and Record Holder - 156.0 Avg (No door blockers)
2016 IASCA Welterweight Record Holder - 157.7 Avg (Door blockers used)
Team Sundown Audio & Fullriver Faction Member