I ordered a TPM encryption add-on device for my PC on Amazon.ca. The order was processed by BidDeal, one of their marketplace reseller. A few days later the status changed to shipped and I got a tracking number. But the tracking number never became recognized by Canada Post. Weeks after the latest possible delivery date, the item had not arrived. I contacted the seller (bidDeal): no response one week later!
Fortunately Amazon was honest enough to reimburse me.