As already said, eQuilter sells fabrics from most of the standard manufacturers. They are my first stop on line and I have used them many many times -- every now and then they get backed up and aren't quite as timely but they always send me updates if that is going to happen. I tend to shop the sales, especially when the extra wide backs are for sale. Their cuts tend to be very exact -- you are going to get 36" and not 37" for a yard.
I don't do panels very often, but I do really like the pattern design section for setting ideas.
https://www.equilter.com/pattern/cat...ttern-designer
I love the scrap packs, right now they have a large selection of options:
https://www.equilter.com/category/38...se-scrap-packs