Zafu and Zabuton.
I purchased both from Zen Home Stitchery decades ago when I was a student and it really HURT financially. One of the best purchases I made in my life considering how much use I got out of each. Both are thick and firm ( buckwheat/kapok stuffing ), very well made.
If you decided to buy a quality cushions, shop around for ones where the covering can be removed via a zipper. Eventually you will want to wash them.
In reading the scriptures, there are two kinds of mistakes:
One mistake is to cling to the literal text and miss the inner principles.
The second mistake is to recognize the principles but not apply them to your own mind, so that you waste time and just make them into causes of entanglement.