Thank you Byron. Exactly what I said above. Here is what the Tony Hill site says about "Turkey Rounds"

Turkey feather rounds are the secondary flight feathers from domestic turkeys. (The primaries are stiffer and more pointed). The feathers are about 10-12 inches in length. This is a versatile larger feather for a variety of craft applications. The shaft can be carved into a quill pen nib. The colorful feathers are also popular with children and can be incorporated into a number of costumes and play activity.

So, unless you can find someone marketing secondary flight feathers from wild turkeys, I would suggest looking for wings from wild turkeys. Then you can obtain your "Rounds". The term is only one attached to these flight feathers for marketing.
Thanks for adding to the proof of what I said.

Denny