I just got an email from Marshall's Dry Goods. They just got in some Riley Blake and that line has a lot of I spy type fabrics. Minimum order is one yard, which is not so good, but they are only 4.99 per yard.
https://marshalldrygoods.com/shop/home/riley-blake-designs/brands/?sort=newest
This one came about a week ago, so they may be sold out of some of it. This is Kanvas Studio, which has mostly I spy fabrics.
https://marshalldrygoods.com/shop/ho...s/?sort=newest