“After a very strong second quarter, Apple saw growth slow as both consumer and commercial (including education) shipments declined, and rumors of a forthcoming iPad mini began to heat up,” said Tom Mainelli, research director, Tablets at IDC. “We believe a sizeable percentage of consumers interested in buying an Apple tablet sat out the third quarter in anticipation of an announcement about the new iPad mini. Now that the new mini, and a fourth-generation full-sized iPad, are both shipping we expect Apple to have a very good quarter. However, we believe the mini’s relatively high $329 starting price leaves plenty of room for Android vendors to build upon the success they achieved in the third quarter.”

Although neither Samsung nor Amazon (AMZN) release tablet sales or shipment figures, IDC estimates that the two companies’ shipments “surged” last quarter. “Most notable,” according to its press release, “was the impressive quarter turned out by Samsung—driven by its Galaxy Tab and Note 10.1. Samsung shipped 5.1 million tablets worldwide in 3Q12, up 115.0% from 2Q12; that’s an increase of 325.0% from 3Q11, when it shipped 1.2 million tablets.”

You can read the full release here.

Below: IDC’s tablet spreadsheet.