[CSX 4133]

Unfortunately neither offer sales, the only savings can be on shipping costs if you live fairly close. But since Krause is on the west coast and Sasco Sports is in Virginia it's irrelevant cost wise for someone in Nebraska. You might check with JEGG's, they carry the Goodyears and might be willing to source Avon's if they are a dealer for them as well.
If you decide to go with Mickey Thompson's or something similar Coker Tire carries them in Cobra sizes for a decent price. There just aren't a lot of options in 15" original sized tires.