Sort into 2" and 21/2" sets and look very carefully for them. If you have plenty of each no problems. You can cut the 21/2"down to 2" not what you wanted to hear.
I think I would begin with fat quarters . I have found that jelly rolls from good and poor manufacturers contain faults of all kinds. Personally not my favourite. But do a search for quiltville . Full of scrappy quilts which you could use your scrappy for.