Pillows

The 26-27 inch pillows are available in stores like Linens ‘N Things; and Bed, Bath and Beyond.
Online they can be purchased at www.spiegel.com

The 30-inch pillows can occasionally be found in stores but we do not believe most are great quality. We offer those in both down and fabulous soft poly.
Find them here: Touch of Europe Pillow Inserts.

Duvets

Duvets are available in stores like Linens ‘N Things; and Bed, Bath and Beyond.
Online they have them at www.spiegel.com

A customer was kind enough to share that she found a source for duvets that works well.
Belk has a mattress topper (it's $30 when it's on sale) that fits most duvet covers like it was made for them. They are soft and fluffy and replicate the feel of European duvets very nicely.