Ruan,
your problem may be that USPS priority mail shipping!
Your price is high, in general, insurance is extra & there's no true tracking number via USPS & no guaranteed delivery date. too many negatives.
Most people prefer UPS or Fedex.
I use them AND I'm a part time USPS carrier!
For heavy packages, like a bowling ball, UPS and FEDEX just do better, MUCH better.
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"...for advice is a dangerous gift, even from the wise to the wise...."
J. R. R. Tolkien